Malicious PDF — malware analysis report

Static analysis result for SHA-256 8441171a5eac5459…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 21:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4965899b4918f32fac03c3df8e237a11 SHA-1: f6f31da6570174540317a1947b4863c8665918ff SHA-256: 8441171a5eac5459d26bf4e96da7715c82c34514564ade701d409d38339a6f42
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body and heuristics indicate a lure for free images, likely a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host a link farm for SEO poisoning or redirecting users to malicious sites.

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=airplane+images+free++for+mobile In PDF document text
    • http://files.flurryoffun.com/uploads/1/3/1/4/131453194/8155993.pdfIn PDF document text
    • http://files.athenscountyantiquemachineryclub.com/uploads/1/3/2/6/132681954/4605497.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/1/0427/5834/0774/files/kezet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/87418372717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5944/3862/files/19436801031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/67892792599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/96018297459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/fezoked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/50473198599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1011/3186/files/jazz_guitar_music_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/99666592961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2089/3851/files/jotamejekolanuvoxaxuron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/tamil_christmas_songs_mp4_free.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 3

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_off00006451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5348 bytes
SHA-256: d5b41cd3da99b8461c6b0091e34acc36d9ed919c3e161d0e60a9aa05e5ca2a31
font_01_sfnt_off0000765f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x765F 10420 bytes
SHA-256: e2b4cd83d86169f2e3e3fef49441bafc9368be0b2989afc9879f6cf96d121b04

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