Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c3a05378b2cb73…

MALICIOUS

PDF

41.5 KB Created: 2020-10-17 01:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e449de780b4598e50c0925865c0f9a64 SHA-1: bd93bb716f7a8a95d78250bdf4a1ce8ad1ffe530 SHA-256: b6c3a05378b2cb73f7e8905751f3779b2e7ade454f10a4bd628886fefdb69cd6
194 Risk Score

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://ggtraff.ru/strik?keyword=ejercicios+de+unir+puntos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f89247318823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f8a142bdcc95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8a119d255b8.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f86f7a9360ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5f89c8f4379db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f872068c8ec6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4255cf-5660-436d-aa5a-661fae4c9674/kopezomukirigag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67753f05-e09d-409e-9daf-55f7446b57ec/nivodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d3cf0f-7e7b-4f6e-81a0-5cf096a589cf/xetakexorakasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6323d4-1ede-4318-af28-0bfb35dfc924/zegajoforaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92543f54-0745-4e1e-ad27-43c628e48bf8/48858134326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/everett_alvarez_high_school_home_access_center.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1605/1096/files/my_trade_offer_url.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7451/8691/files/55123991907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7332/6242/files/pesefarebitubozowamew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3130/5623/files/gta_apk_download_offline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4680/4889/files/ge_universal_remote_manual_24927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7084/3797/files/software_architecture_in_practice_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/long_term_debt_ratio_definition.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 4860 bytes
SHA-256: 01ffd2c991c1868e09c3be2600e336b8331640d159c0bcd6f311fa0332e2439b
font_01_sfnt_off00007548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7548 10520 bytes
SHA-256: f21f8e050424a138e175d7237806f6f9e1eeea890fe9b3b1f7e6593593e57028

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