Malicious PDF — malware analysis report

Static analysis result for SHA-256 7776551e4a640460…

MALICIOUS

PDF

39.1 KB Created: 2020-08-18 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 15515305d209f68b0f31b1f8d6f54d2b SHA-1: 4f843d236682cf184d583998368b4e30c9f0f090 SHA-256: 7776551e4a640460aee9b92993b9c54c01117a917e7ad25cfbd07de82d170d1f
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a lure for precalculus textbook answers. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to drive traffic to potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing or scam attempt.

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.ru/pify?keyword=precalculus+textbook+answers+pearson In PDF document text
    • http://gakedena.runningwildmidwest.com/uploads/1/3/2/6/132695535/3036046.pdfIn PDF document text
    • http://jujije.emiratescabincrew.co.uk/uploads/1/3/1/4/131483083/68e9c1745fdc.pdfIn PDF document text
    • http://files.heartxoutfitters.com/uploads/1/3/0/7/130738799/kupanesumogit_niwuf_davol_xamojovag.pdfIn PDF document text
    • http://files.azbasketballcoaches.com/uploads/1/3/1/3/131384589/pojunejowe.pdfIn PDF document text
    • http://wipopawu.marryuscaroline.com/uploads/1/3/1/0/131070420/9732896.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/1/0438/6376/9243/files/94671861752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1496/2848/files/agnus_dei_piano_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/18844725970.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/24063636745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1051/4334/files/gifofiviganewakeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/97666531642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/zadomuwisemalaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.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 7

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45C2 5128 bytes
SHA-256: 76c8d8803790de2cc86fbec44a559e9820340751f9476319dfed2ca3cd56427c
font_01_sfnt_off00005745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5745 13612 bytes
SHA-256: 1cc50dfd0b0781d1fa423ee1f36151c0bd1a8144d43c92488d0a23ca5fe6b52b
font_02_sfnt_off0000816e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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