Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf542c2cbb9b3d98…

MALICIOUS

PDF

60.3 KB Created: 2020-10-18 13:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 368e0f84e2191a95b30bca7727440524 SHA-1: ecf9b676563833185390bf2045edb63f367b0811 SHA-256: cf542c2cbb9b3d981275d40f7773fbb91b98656083eb9ce5559e5581f8462350
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically designed to lead users to external malicious infrastructure. The embedded URL 'https://ggtraff.ru/123?keyword=linear+programming+problems+and+solutions+examples+pdf' is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=linear+programming+problems+and+solutions+examples+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f8b71214eab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8900e7dfb66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f874a39f2ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8bbdbce72ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f8bd19f5b706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f89b16d5f20e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f880c80cea23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/watch_nightmare_on_elm_street_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/7248/1190/files/91790008893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/5043/5228/files/innova_factory_store_facebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0055/1365/files/list_of_nouns_and_pronouns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3611/3571/files/one_bendigo_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c0687b-0246-4499-bc4a-7672242ef121/bomaxopusuzelugej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54c4782-3e2c-4b00-9e58-c43752c42247/lotuwujekorevesawunolega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300864ab-af1c-4121-a29a-91678313e367/77336761643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d1f6a4-a993-4284-a76e-aa3094ea5770/jeff_buckley_lilac_wine_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae92185-972b-4ff0-9b47-bb32f958f463/17311751654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdf5e1e-279a-47ed-a5f0-9fcbf881e8e6/gilivedupiduponagowaxal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d11555-11a9-4a67-ac52-615e1305d848/nexopopoborosexeniwup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27792090-e76c-447a-80eb-8995c16a86c2/17388705403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0c4f2f-76a5-45fa-ae13-e2ee46474847/10425841162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7821852-cb5e-4eed-bcaf-7d854187fe83/45811548929.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B81 3364 bytes
SHA-256: f3e2fd5cfa26a2f7993ea5233d2b55a2f60604e919d058735c2a4e9f9378ad5e
font_01_sfnt_off00008786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8786 5392 bytes
SHA-256: 088083c424e4ba0fdd3300320b3d1b1a39e65630cd3b2bf9d32be282f623f030
font_02_sfnt_off000099bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99BC 10900 bytes
SHA-256: 83ccc4525752b8547cc3c758b0b88ec247cf16d2c21feea682cebc597ae42deb
font_03_sfnt_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2
font_04_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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