Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a21899c6b29880…

MALICIOUS

PDF

45.4 KB Created: 2020-08-15 08:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 998dd9fb1d9ae837093b2eaa85d8e943 SHA-1: 2d7a8bfcd286b549767137de1211b6406ca26dd0 SHA-256: f6a21899c6b2988054d6afeb7260bf11dd881280b20c51745d669ce2583a99a1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. One of the embedded URLs, 'https://ttraff.com/pify?keyword=high+density+pu+foam+sheet', is identified as a known malicious redirector. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms. The primary intent appears to be directing users to potentially malicious external sites.

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.com/pify?keyword=high+density+pu+foam+sheet In PDF document text
    • http://files.toronto-dialabottle.com/uploads/1/3/0/7/130739028/eec740ed17b2.pdfIn PDF document text
    • http://files.hepatitiscmsg.org/uploads/1/3/0/7/130739333/313615.pdfIn PDF document text
    • http://files.imogendickie.net/uploads/1/3/0/7/130776265/mamefidu.pdfIn PDF document text
    • http://files.musicacollinadoro.com/uploads/1/3/0/7/130775357/56fb4a537f.pdfIn PDF document text
    • http://files.livelearnsurvive.org/uploads/1/3/2/3/132302960/gemalib.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/69865881622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/91876799181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/rifewizizalazim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4931/2665/files/vozewovowezovamilovoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/bass_guitar_books_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/shadow_of_the_day_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/lowatobof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/chemistry_dictionary_free_for_pc.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 7

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_off000067ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5388 bytes
SHA-256: eb71e706231aa2581405d7fcf59b306574d1176bd36f4917950c9cfdbf97fb78
font_01_sfnt_off000079e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E8 15180 bytes
SHA-256: 20fd4855c43ed61cc1b49f45a6bac9ad3e786dd691a58d8c348d7725a185f937

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