Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa4697fa949c84e…

MALICIOUS

PDF

42.6 KB Created: 2020-07-29 23:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a343f70c0d563bb034203f48b33b412d SHA-1: 11ca4fbb2538b51cc65300e91a00f32c3fcf8e24 SHA-256: 5aa4697fa949c84e8be6f86f43a2e7f2a264abeacd572040967cb1dac7f5ef40
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to a redirector service (ttraff.ru) which is flagged as malicious. This indicates a likely SEO poisoning or link farm attack designed to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=recognition%20colors%20worksheets%20for%20preschoolers In PDF document text
    • http://files.daily-donuts.com/uploads/1/3/1/8/131856907/526906.pdfIn PDF document text
    • http://files.ricotroostphotography.com/uploads/1/3/1/8/131871721/vuwezezadetime_vegik.pdfIn PDF document text
    • http://files.galgoamigo.com/uploads/1/3/2/7/132740836/e6a9ab3a9f.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/1/0433/0687/7080/files/fusuzirosaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/10286310720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/79053442187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/3536584530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65925238695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/xozolanerana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/foxevofizuxojaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4491/2802/files/wujorikoleki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/81850488559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/mufudubototuvizenotor.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 6

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_off00006a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 5020 bytes
SHA-256: 6656fa465d7e86b2ef62a46adacba6286815797081b3f83814b916c834a64f4f
font_01_sfnt_off00007b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B37 9952 bytes
SHA-256: 560656bf012234b702e209d2c35abe105a71ac85a366da4b851de8a12634b0e5

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