Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3b35b2267e4225…

MALICIOUS

PDF

58.1 KB Created: 2020-08-10 14:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: af20c83d7131dad3e139140f472d6a3d SHA-1: e2674d40aa276e179f6695567b59c414e1d1e297 SHA-256: ac3b35b2267e422506927a32e4915cd2312a9e5cb63e0f12c26436bdd077f88c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute malicious content or conduct phishing. The ML classifier strongly supports the malicious nature of this document.

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=elastic+and+inelastic+scattering+pdf In PDF document text
    • http://files.millerchitty.com/uploads/1/3/1/6/131606789/fajugegobev-desowesef-nizaj-wugutamijus.pdfIn PDF document text
    • http://files.mrtoddsclassroom.com/uploads/1/3/0/8/130873922/pekes_vijekenoru_pavitonizadaw.pdfIn PDF document text
    • http://files.curvygirlzplus.shop/uploads/1/3/0/8/130814716/7682149.pdfIn PDF document text
    • http://tisumi.owlridgetaxidermy.com/uploads/1/3/2/6/132683071/6436083.pdfIn PDF document text
    • http://jirirox.pral153.co.uk/uploads/1/3/1/3/131380005/kalib_kaxevati.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/1/0430/6026/5117/files/80501090523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/xajiladafopokofokufesezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4388/0093/files/poker_3_keyboard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/49162707641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/agnello_di_dio_rns_accordi_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/tree_of_qliphoth_asenath_mason.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3330/4986/files/51950065467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/algebras_lattices_varieties.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/65341728610.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_off0000a5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DD 5280 bytes
SHA-256: 77fedd3dbe2a3c8bf2f34ad359c8b09273164e283a29e532d1a768be315bcbb4
font_01_sfnt_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 10024 bytes
SHA-256: d197b608321d231c3dd04a437b99e98d9499e8fe43875dd41f2eb0f1c5e6d878

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