Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ca99af0a6a3bfa…

MALICIOUS

PDF

43.9 KB Created: 2020-08-17 04:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1af2e1657b228ce0bde7a2f104d74f4d SHA-1: 9c7fb467f6b669c6f7b4476cf44d12c37903dc3c SHA-256: 39ca99af0a6a3bfa5525f31fff4ebba7e60cee06dca17a7e95375ab0aa0284a3
162 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with one specifically pointing to a redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and the IOC list. The primary intent appears to be redirecting users to malicious content via the ttraff.cc domain.

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.cc/pify?keyword=carmageddon+2++windows+10 In PDF document text
    • http://files.stormcallsiberians.com/uploads/1/3/2/6/132695405/razesezop.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/1/0434/6295/1077/files/36863608169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4303/5048/files/54017263046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/83480999962.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0957/1989/files/gejodatafixativib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/marezemorabekolovujosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/javipikemazilor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8157/8136/files/volegomapinubepego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/emotional_regulation_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/decimal_to_binary_in_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/free_business_letterhead_template_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/arthritis_uk_knee_pain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/10046723764.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_off00006da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA0 5436 bytes
SHA-256: 2ccf383e4f31898a5da5e10716d997a56947cbf03f05283163c1c783550a8d88
font_01_sfnt_off0000801b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x801B 10192 bytes
SHA-256: ede818fcd814548c9a3c3d9ffb4d71d01f2b8d54a067413ebaeace62209ee4a5

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