Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac953c137b09ba18…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 06:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9dec4383c0ace2e34d139400633b5e44 SHA-1: 744d61b746dd3c57fcb0569ed9c0cc2f80259716 SHA-256: ac953c137b09ba182cbf975179ea2f6755b9b046a684d59dc1e105373cad0e85
194 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which point to external PDF files, forming a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body contains garbled text and a URL that appears to be part of the link farm. No scripts were extracted from this sample.

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=english+grammar+board+games+pdf In PDF document text
    • http://files.oa-involve-agewell.ca/uploads/1/3/0/8/130873983/c0d321.pdfIn PDF document text
    • http://files.pacehighchoir.com/uploads/1/3/1/8/131871891/2056809.pdfIn PDF document text
    • http://files.buckinghamcharitycup.co.uk/uploads/1/3/0/8/130813730/1254457.pdfIn PDF document text
    • http://files.21cclcdm.com/uploads/1/3/1/3/131379730/5081168.pdfIn PDF document text
    • http://files.ulsterprojecteasttennessee.org/uploads/1/3/1/6/131637239/potibudikolatabe.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/1/0439/1125/0075/files/calibration_of_a_burette.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3755/files/5815401534.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5613/5334/files/absceso_dental_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1878/7736/files/55737813382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/iupac_rules_for_naming_alkynes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/padejedidalasosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/rotusagunijuluzavasomap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/66284880831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/javusexij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/15275302434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/61469535483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/83419837189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.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_off00006e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 5552 bytes
SHA-256: b3446dc562d897a704fd6ca6e5f5beef62fe9ccbc989fa1f14e90fd61bc06e89
font_01_sfnt_off000080c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C3 10060 bytes
SHA-256: ecde872e2e111ebff5347d1b34360172a01f96f3197f71dc9595e1f0d26cf6c5

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