Malicious PDF — malware analysis report

Static analysis result for SHA-256 103803d6bac335e5…

MALICIOUS

PDF

36.2 KB Created: 2020-08-03 11:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c2f41bd167923a82a01a1abcc37f3c5a SHA-1: e083b1867e6c390bf9fd980e834c0e27bd64e2f3 SHA-256: 103803d6bac335e5b6b55c06fe2e1d9bc71023a29e510a49390655056900530c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text suggesting it is a quiz, likely a lure to encourage clicks. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains a mass of external links, suggesting a link farm or phishing 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.cc/pify?keyword=subject+verb+agreement+multiple+choice+quiz+pdf In PDF document text
    • http://files.bertingelaere.net/uploads/1/3/1/6/131606619/4234185.pdfIn PDF document text
    • http://files.obacuisine.com/uploads/1/3/1/6/131636737/mowamejegumup.pdfIn PDF document text
    • http://files.thepollardgallery.com/uploads/1/3/1/3/131379615/bipepufuwatogig.pdfIn PDF document text
    • http://files.shenandoahpermaculture.com/uploads/1/3/1/6/131606060/8601585.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/1/0439/7151/0430/files/35898823104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/zexufowalelunitopapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0772/0093/files/sidamam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/jejemebugosesanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/gojinifaxarefizivuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/89369776348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/jekibexolusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/dagijikazubago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/jozijikoregukufoted.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/12378004308.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_off00004c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7B 5944 bytes
SHA-256: 81aa3dc58362616fa7f1709a0bacf493c4ea7ba58be82faa78cb1172ef22287f
font_01_sfnt_off0000609f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609F 10440 bytes
SHA-256: 1379c649b252984dcb21bfc01053331cd29cd204845331b718bac9fde0452b4a

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