Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c981b68f5852c7…

MALICIOUS

PDF

39.8 KB Created: 2020-08-18 17:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d6abd41ecd615f78156dd33a9a5b0e08 SHA-1: fdea88b2473481bf4bd8cbb5930b5fdc4ecf0163 SHA-256: a9c981b68f5852c706f867fdab925957dbfa919d98fb0af7b31f962733f3d447
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=aqw+legion+revenant+class+guide'. The document body, though heavily obfuscated, also contains this URL and references to a game guide, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The presence of multiple Shopify-hosted PDF links indicates a link farm strategy.

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=aqw+legion+revenant+class+guide In PDF document text
    • http://files.desertmiragekennel.com/uploads/1/3/1/3/131380687/jomiperoxuw.pdfIn PDF document text
    • http://giwumap.nationalparkswithkids.com/uploads/1/3/2/3/132302780/nomojamipab.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/1/0430/8166/2628/files/xafubavewimisutor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/59416314918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/february_song_piano_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/56645499609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2251/5351/files/nekam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/96335355076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/12870843538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/tulugevufirogopumip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/59303553228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/betalactamicos_veterinaria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9464/4638/files/cahier_de_vacances_ce1_ce2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2175/2726/files/65076324451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/air_pollution_project_file.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_off00005d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D82 5376 bytes
SHA-256: d6c0acdaab44906b8d6d58fdb8eeec42572895b2f71381cff743bb95e0c4187c
font_01_sfnt_off00006fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 10160 bytes
SHA-256: ebe32f60c805a558f182826592424bda1646c65410f61e14edb3f6752a816bb3

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