Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81bd3b648ee7cf4…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 67c3a7e1f73bb06332df9c60b3a270fb SHA-1: c4fef9d4bb2ec6c6494cf77cc0991d6f55c8e146 SHA-256: a81bd3b648ee7cf40964af323249536a477452d117262beaf117e151307a8c0e
162 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/wb?keyword=asp.net%20c#%20tutorial%20for%20beginners%20with%20examples%20pdf, which is flagged as a malicious redirector. This indicates a likely attempt to direct users to malicious content or phishing pages under the guise of providing links to PDF documents.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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/wb?keyword=asp.net%20c#%20tutorial%20for%20beginners%20with%20examples%20pdf In PDF document text
    • http://files.labyrinthcreations.com/uploads/1/3/0/8/130874642/8121399.pdfIn PDF document text
    • http://files.ergoproperties.com/uploads/1/3/2/7/132712185/2b2e7361c80.pdfIn PDF document text
    • http://files.amproed.com/uploads/1/3/0/8/130813827/lovebaxuwejeg.pdfIn PDF document text
    • http://files.designsbycaralouise.com/uploads/1/3/0/7/130739891/468aa5.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/1/0438/8493/7384/files/purpose_driven_life_day_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/9178160975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/ultimate_gd_t_pocket_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/36674046413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6742/4409/files/62414661335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9755/8941/files/donunawitipagubabugibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/gefil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/90462019166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/nawiginasixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/rerirumigagajizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/nalisizedokepebutepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46506788711.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_off00005f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 4240 bytes
SHA-256: 4b3755e223789f1c9932f1d83c578d3a6124d517d6e0173baa74af393e062087
font_01_sfnt_off00006dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 10408 bytes
SHA-256: c92d29145934a5e99383a09730a03c2f0fcf89fdb75a29dd8a085b07b4eab948
font_02_sfnt_off0000915c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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