Malicious PDF — malware analysis report

Static analysis result for SHA-256 421daa7c79b6b386…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 19:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c44de894e1ac263110644bae2c567508 SHA-1: 2ffe6934a73599ab025710fb7cf243f1064fb2f5 SHA-256: 421daa7c79b6b386924046b7aa05b90b09f884fd2c467b9e1036bb9656653b64
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'ttraff.cc', a known malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation to increase visibility. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=cobs+bread+hot+cross+buns+nutritional+information In PDF document text
    • http://files.merebrookllc.com/uploads/1/3/1/3/131379594/zajid_xepiru_firiwa.pdfIn PDF document text
    • http://files.stefaniegraperphotography.com/uploads/1/3/1/8/131871854/2410119.pdfIn PDF document text
    • http://files.bajaartcollective.com/uploads/1/3/1/4/131483632/virudir.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/1/0429/5517/8150/files/90471603502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/carcinoma_basocelular_elsevier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/13309240511.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/97005903157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/59712173427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/sedip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9922/6265/files/programme_nutrition_sportive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/tosonumamupatobugakine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/billboard_music_awards_2003_performances.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6694/0828/files/intermediate_algebra_9th_edition_bittinger.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/adolix_split_merge_portable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/saki_saki_song_video_dj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57D7 5304 bytes
SHA-256: 6cb383c463806958d754e31bb043dc6a6ec3426e8727b889214959b3526b10bb
font_01_sfnt_off000069ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AD 10428 bytes
SHA-256: 3f451b14b163c659f7da416f180f8c57e5c53b029ebfac1a6073d36b8f2aedad
font_02_sfnt_off00008d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D59 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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