Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9c8f8c4a63fb28…

MALICIOUS

PDF

37.6 KB Created: 2020-08-14 12:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6831f0824dc16cf35b5c5f0f3612151a SHA-1: 53e95fc17eb096c869929e78effe7fd1b2b09781 SHA-256: 3b9c8f8c4a63fb28e3d66ed59a8270a418d9ac435b88de95374f0c2fa60d1ed5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'biology quiz pdf' and includes the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely to obscure the malicious destination. The primary malicious IOC is the redirector URL.

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://ttraff.com/pify?keyword=branches+of+biology+quiz+pdf In PDF document text
    • http://files.acuityworks.com/uploads/1/3/1/3/131379748/6c253247d5ed.pdfIn PDF document text
    • http://files.ovalaboratories.studio/uploads/1/3/0/8/130873741/07e1acf5578f.pdfIn PDF document text
    • http://files.shinyaxe.net/uploads/1/3/2/7/132740343/7506111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5322/7932/files/hl_2280dw_drivers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6746/files/57388173553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/warifija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/81003138999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/76470400637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/beautiful_disaster_google_drive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8878/1219/files/dexiluxalenetorawobekor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9981/4040/files/english_grammar_bangla_version_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/xunejubazekikol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3187/2166/files/thermo_king_apu_troubleshooting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3282/7288/files/8595240604.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 6

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_off00005343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5343 5884 bytes
SHA-256: eb3e9cfe1be2ead99f9e24cf06f129c1c1a5d3b001d57c18fe32ed15838f206b
font_01_sfnt_off0000673c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673C 10284 bytes
SHA-256: 54d621bb5cb5dc348f53852e3b6f7c8057ef5c0eb29435c44a9c9564ebc75eea

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