Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c71e6d6df288f1c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-03 13:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5ca95a2f8d3c050ba2d61e5297aa60c4 SHA-1: 1cbb65b0e4106693a2b77f2e5a0e439702ad1685 SHA-256: 6c71e6d6df288f1cfb650e47338d872e7204f0c5fcb3def7be608c0de57c24f8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a known malicious redirector infrastructure, disguised as a "Couch to 5k metric pdf" download. The document body and heuristics indicate a link farm strategy, directing users to potentially malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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=couch+to+5k+metric+pdf In PDF document text
    • http://files.brianlall.com/uploads/1/3/2/7/132740880/digomazeweb.pdfIn PDF document text
    • http://files.keebskorner.com/uploads/1/3/1/4/131437018/gunovilivax_zukuzaguteveto_kefususopubom_wifibokedoteje.pdfIn PDF document text
    • http://files.fabloranhairology.com/uploads/1/3/2/6/132695828/pazid-zixibelozitik-vunuz.pdfIn PDF document text
    • http://files.gokidtrips.com/uploads/1/3/2/6/132695372/e6e77b49c1.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/1/0431/1403/7397/files/nusuwavafujafixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/94984001394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7794/1913/files/git_remove_branch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7943/3382/files/tunanimit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/xadifenexosesatulerarevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9706/1531/files/buxewifawufuxuxaxuroz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/pukunaget.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/xebegobajededuvewawuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/bikuzidokibagekoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/43035352232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sikotifukiv.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_off000073f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F3 5068 bytes
SHA-256: 78516d1ec45258f5a8bef1f8e5a6e833b948b213b454fb95de247a8dc4fae64b
font_01_sfnt_off0000850d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850D 10968 bytes
SHA-256: bad9d220a287cc5faf0768528a824dc35590098765cf4993c32474e912767f33

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