Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10c1cb978002e66…

MALICIOUS

PDF

38.2 KB Created: 2020-08-01 16:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c33e12e7d13b3162e66ae63bfcd3828d SHA-1: 715d9261da55192a266b428d86bc0e4d0b329a99 SHA-256: f10c1cb978002e66dcad730f5abda29c9748dc3ad94bcbba95604f8b9ddc220a
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning attack designed to lure users with seemingly legitimate book downloads. The primary malicious URL is https://ttraff.ru/pify?keyword=calculus+briggs+2nd+edition+pdf, which is flagged as a malicious redirector. 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://ttraff.ru/pify?keyword=calculus+briggs+2nd+edition+pdf In PDF document text
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdfIn PDF document text
    • http://files.trilogybookclub.com/uploads/1/3/2/7/132710743/ragijar.pdfIn PDF document text
    • http://files.feelgoodkickass.com/uploads/1/3/1/4/131408970/5760969867f7.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/1/0436/0182/1859/files/xedoxupawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/bloodborne_ritual_blood_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/sowovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/lilekobom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/liziroraxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/81078500231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0445/9170/files/82241674809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/fizavalegisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/kivinubukorefuzuluw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/lewenafumivo.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 8

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_off00005700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5700 5500 bytes
SHA-256: 34c96567cecb9724a190a978343a46109e8dac28fc76a3782afe273981bf05cb
font_01_sfnt_off000069b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B7 9980 bytes
SHA-256: 25badec1801b4699aaf3c652da3a26dd0fdc85cf135613b71ca698075ce41588

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