Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bb3fe2fb2a6fab…

MALICIOUS

PDF

43.9 KB Created: 2020-08-06 06:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b5c0e6c67156fc67c52ebc5cdb123762 SHA-1: d045fb9aad3951dc8c407ba50b23e52c1cd1e247 SHA-256: 50bb3fe2fb2a6fab960c40632d8a33fff2b41f0815e61ba0cd6081d930d8ee96
194 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to a critical heuristic firing for a malicious redirector link. The document contains a large number of embedded links, presented as "maths worksheets for preschoolers pdf", which ultimately redirect to the malicious domain ttraff.ru. This indicates a likely attempt to lure users to malicious infrastructure through a deceptive pretext.

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=maths+worksheets+for+preschoolers+pdf In PDF document text
    • http://files.caalam.us/uploads/1/3/0/9/130969390/puzesekivud_raxezemexot_xategubugovenut_fuzixanaxemavu.pdfIn PDF document text
    • http://files.inter-nda.com/uploads/1/3/1/3/131379049/1779210.pdfIn PDF document text
    • http://files.sexeducationbytheatre.com/uploads/1/3/1/4/131406977/wuvamubu.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/1/0431/9051/7911/files/bazapoxelobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/zofemokoxodotiniwafudoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6151/0293/files/welusotikiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0513/1421/files/60261286856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/nosafupomudivewegafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/59001271573.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/nuvuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/beseneru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2677/5196/files/65662135186.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 4

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_off000060ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 5036 bytes
SHA-256: cb4916715f518a8b669025cfb5e1e21a9d023912c45d25a1e18a22a4ca5b569c
font_01_sfnt_off000071f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 10084 bytes
SHA-256: 3791851b32ce0aca9a486172bd512da46ea495c31e43f485f45c7f3def36be9b
font_02_sfnt_off00009491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9491 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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