Malicious PDF — malware analysis report

Static analysis result for SHA-256 4277ab850e37e2f6…

MALICIOUS

PDF

39.4 KB Created: 2020-08-14 21:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8ac634347af51178c8fabc7726acbe97 SHA-1: e7ed9d450738a2b96e2b91a9d4424b8b42a30260 SHA-256: 4277ab850e37e2f6ec2ca9fd8f21b7bc7dca7ed11429dac2e132b59c20690bc8
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a link farm containing numerous external PDF links. One of these links directs to a known malicious redirector, ttraff.com, which is likely used to distribute further malware or phishing content. The document body contains obfuscated text and a reference to the redirector URL, suggesting an attempt to disguise the malicious intent. The file was generated using wkhtmltopdf, a tool sometimes abused for malicious purposes.

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=persuader+lee+child+free In PDF document text
    • http://files.lowernorthcoastdancefestival.com.au/uploads/1/3/2/6/132681452/zogesimozojexek.pdfIn PDF document text
    • http://files.pomilee.com/uploads/1/3/0/7/130775724/joketad-zusematu-fusulunax-vipobutazofu.pdfIn PDF document text
    • http://files.chrisleighins.com/uploads/1/3/0/7/130739718/wovozawepotufug.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/1/0434/8493/8390/files/67504190703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8314/4093/files/defawojunanigopejatijupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3718/6453/files/87875672074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/90962393908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/nutejudokiwexuzafowowo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/39138479090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/26901542555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/93125875796.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 2

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_off00005bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDE 5112 bytes
SHA-256: ea22c4b5b9212f44e11e206839e94c6f6758b629f85bb2c2bf37a8fe3d42f149
font_01_sfnt_off00006d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2C 10656 bytes
SHA-256: d168ac6b9121855d2c525007bf1d4ce1b77c54b3fe5ab3468c228df786e5dcab

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