Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3574ffbd9fc978a…

MALICIOUS

PDF

45.5 KB Created: 2020-07-31 10:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1c0cd3e5f02a759d8d1137c803d23ffd SHA-1: 2a1300faf9d95764ec32d50418092318375d7d24 SHA-256: d3574ffbd9fc978ad1138ab430aed744b766f67cc23a85c344da8dfaf4f32f5e
194 Risk Score

Malware Insights

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

The PDF contains a mass external PDF link farm, with one of the primary links directing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'basic cost accounting notes PDF'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful 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.cc/pify?keyword=basic+cost+accounting+notes+pdf In PDF document text
    • http://files.billstrom.ca/uploads/1/3/1/3/131380052/1864127eff24a74.pdfIn PDF document text
    • http://files.mimodelinginstruction.org/uploads/1/3/2/6/132695646/476123984.pdfIn PDF document text
    • http://files.permittechnation.org/uploads/1/3/1/1/131164016/72120.pdfIn PDF document text
    • http://files.seresearchcoalition.org/uploads/1/3/1/4/131438228/5807273.pdfIn PDF document text
    • http://files.lovebabiestennis.com/uploads/1/3/2/8/132814427/b037d404.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/1/0434/8785/4749/files/ruvivunineg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/42268348700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/32346638758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/kexonemuvoroti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7609/1032/files/96770651814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/74910833178.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 8

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_off000075c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 5128 bytes
SHA-256: 819b0413c966bb112f5179599f61f59cf07b37d1d94edea70e26b351b98344fb
font_01_sfnt_off0000873f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873F 9836 bytes
SHA-256: 5e237b78ac128c98efed8e249f33588bc9b2dc5fff8a0d4d3d39ad1233bc7c31

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