Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bffd640bfbdaf8…

MALICIOUS

PDF

41.2 KB Created: 2020-08-01 09:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 48bf1271591d05cf7d1de85173ebb78f SHA-1: 3bf2cb98f688f2d09f41ede2bf0ab5f8bbf59c2d SHA-256: 89bffd640bfbdaf8aa31fa8aaa3332824ec9ff3228fd877b68b8d797e7af316c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious due to its use of a redirector link, specifically 'https://ttraff.cc/wb?keyword=second%20moment%20of%20area%20formula%20pdf', which is associated with SEO link farming and phishing lures. The document's content, though heavily obfuscated, appears to be a lure for a PDF related to the 'second moment of area formula'. The presence of numerous links to external PDFs, many hosted on Shopify, suggests an attempt to manipulate search engine results or distribute further malicious content. 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/wb?keyword=second%20moment%20of%20area%20formula%20pdf In PDF document text
    • http://files.samuelclemens1856.com/uploads/1/3/0/9/130969636/palegejufav_tuginuzesug_rusesoxojuja.pdfIn PDF document text
    • http://files.moses-michael.com/uploads/1/3/1/3/131380845/teref_vezowiraga_vopuso_reseloze.pdfIn PDF document text
    • http://files.steam-era.com/uploads/1/3/0/7/130740586/nidamabebezogore.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/1/0431/1564/3031/files/29498593872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/76447670325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/kitono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/33263254698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/78714426657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/31258389161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5475/9069/files/fakowaxevuminemisabiwit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/55440015196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/jupujifunusogetujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/wojotelusozole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/csgo_config_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 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_off00005d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D28 5228 bytes
SHA-256: 35c1464bdf3e9591eabb5facec093dd3cb9500bf861a348bf76beab7a234d7a6
font_01_sfnt_off00006ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 12936 bytes
SHA-256: b19a50c24599260d7f2be40666b4ab0fcc3fe0b574c7c2a1c816fecb53ea3467

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