Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7962823531122f…

MALICIOUS

PDF

40.7 KB Created: 2020-10-30 19:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 78858fbfd31233a6e1151a4f242c35a4 SHA-1: 2302c8a2051652234090bd2f2142ea7a67198669 SHA-256: cf7962823531122f3daf176695b922ee5aeff6b36908b0584929bedd011f3ad6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector URL known for malicious activity. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to trick users into visiting a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/strik?keyword=letter+to+dad+on+wedding+day+example In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falufusu/61525191017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6027fbf-974a-4fbc-aadd-30213ae04c9b/33022851897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd52e3b-3bda-4625-9bf4-a0d587118212/patuzerem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/world_history_textbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5300/7516/files/free_download_drastic_cracked_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cc6895-8c0b-4400-a7ca-8119cbff9312/51695254963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c523d8b4-00c9-429d-94d9-5a0ea644c74b/jelalusojizejikajifos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7941973b-28ea-4349-85bf-36f031a6154c/34415416595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6258701-5b51-4cfc-9dc0-733a39cffaf5/vobibedodivapazaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b07e170-8a08-4be1-a23e-0c53248f6928/kroll_background_check_authorization_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0600/6724/files/tidunisukele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2430c6-97bf-4554-a093-ada52e47bc17/first_aid_step_2_cs_google_drive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3972/2138/files/raise_a_hallelujah_chord_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99e56a5-95a3-4fdb-9d90-179d97eaaec0/coding_interview_cheat_sheet.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CB 5304 bytes
SHA-256: 6b3e611f9ad1c6529b4852d2b3ea059e21f08e19bf12b292c93421e10d791c02
font_01_sfnt_off000074db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 9764 bytes
SHA-256: b99a65fcb7ad075455b74d05323aadc475158d215f4d69c024d44030fc274a1a

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