Malicious PDF — malware analysis report

Static analysis result for SHA-256 935c6aa8ab9d43f7…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 23:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: aef1a35ae3bc2fb4d64374522bf49d6a SHA-1: 2470db90aac613ccb6ef2fef85f142bc427e84a6 SHA-256: 935c6aa8ab9d43f7305bd7e23e22dd93edc2fa030ec1500ed91c5bc5daf72572
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a lure to external malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this is a phishing or redirection attempt. The ML classifier also flagged it with high confidence. The document body contains the malicious URL, reinforcing the attack pattern.

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=protein+structure+levels+of+protein+structure+pdf In PDF document text
    • http://files.fideliaibekwe.info/uploads/1/3/1/4/131452929/ribabafe-zitivokorilimux-fikisujitugar-fuxajat.pdfIn PDF document text
    • http://files.syncdental.net/uploads/1/3/0/7/130775862/jizorovivemuji.pdfIn PDF document text
    • http://files.ericmouledoux.com/uploads/1/3/0/7/130774990/fikemalepim.pdfIn PDF document text
    • http://files.trinityprespca.org/uploads/1/3/2/6/132683137/zuwuvasin_sodutenutubin_zopanene_sawoba.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/1/0428/9835/8432/files/rerotapok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6702/2239/files/develunex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/lovujezezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/92334392966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/zoology_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/famadaburijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2067/1386/files/sikesamemeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/94393203318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/nefusafikubusigonuxap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/vatiwoxezixaselugafaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.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 4

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_off00005e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5000 bytes
SHA-256: 51d6303b78478dc805d1d2e0d66ad207096a19aabf2c6cd89ce9dc528f6c1e2b
font_01_sfnt_off00006f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 9852 bytes
SHA-256: 2be22c3271902fa060e84fb823d399c2a3d19629f9851858540d0463fe24409a

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