Malicious PDF — malware analysis report

Static analysis result for SHA-256 311787cb6cc78fef…

MALICIOUS

PDF

39.2 KB Created: 2020-08-22 01:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b719631ba6b8e3be8b76a6697d995510 SHA-1: 32944c10979d5a6a9adf17e51208013409fd2fef SHA-256: 311787cb6cc78fef1715a1164c29ee7461d219a0945441360ce23b7591b470a8
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=math+for+data+science+cheat+sheet'. This URL is presented within the document body, disguised as a helpful resource. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, but one specifically to a potentially malicious domain. The ML classifier strongly supports the malicious nature of this PDF.

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=math+for+data+science+cheat+sheet In PDF document text
    • http://files.shansbandsandmore.com/uploads/1/3/0/9/130969993/gefujuxisuve-gexudonekemewaz.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/1/0438/6032/8608/files/nice_guidelines_ptsd_update.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7360/9636/files/13872565841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/xamemod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/f2p_melee_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9183/5545/files/zanenugogeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/68619302620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/43560876829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/2446/0445/files/gutitonezenas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/94744933470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/haryana_laboratory_attendant_answer_key_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/87172868355.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 1

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_off00005d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D03 5080 bytes
SHA-256: 4eeb66514069a2f52f018d6d1b29d438ee759cf896c4ed541b969989c34cda0b
font_01_sfnt_off00006e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4A 9924 bytes
SHA-256: 0668e31f8a15fda2a2e74e2a8642f96a1a9bd52985b4755d2a2cfc13a0aac3f5

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