Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc1d74c1f153691…

MALICIOUS

PDF

36.3 KB Created: 2020-07-31 14:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0ff5138c919881d5547910d62714cdf6 SHA-1: fdcdd6b44d8df87ad37e1bddfc14e29ed4b93108 SHA-256: 5dc1d74c1f153691e6dfddb198ff0c3f05bb53d3a3a07595e790e7852f119325
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector, designed to lead users to external websites. It includes a large number of links, many pointing to a redirector service, and is flagged by an ML classifier as malicious. The document body, though heavily obfuscated, contains text related to 'advanced english multiple choice test pdf' and references wkhtmltopdf, suggesting a lure for educational content.

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=advanced+english+multiple+choice+test+pdf In PDF document text
    • http://files.embracingwisdom.com/uploads/1/3/1/4/131437889/bewotode_fitakakusoxidal.pdfIn PDF document text
    • http://files.missionpeakrobotics.com/uploads/1/3/1/4/131409090/jikexuzezep_zubuwupuko_semuj.pdfIn PDF document text
    • http://files.coaster-notes.com/uploads/1/3/1/1/131164452/pexirigurufoxa_samanavogovote_ramamimugafod.pdfIn PDF document text
    • http://files.neo-hawaii.com/uploads/1/3/0/9/130970003/3616855.pdfIn PDF document text
    • http://files.tomluhring.com/uploads/1/3/1/6/131637147/664b5686a.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/1/0431/0417/4233/files/bafujat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2610/3971/files/pagiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/tasamefuzeralatevawepap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/zavutuliramegebumeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/87312550099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/90596947164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/fipebumolulogigolijitoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/25087237819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/kifebovinobekasibijisep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/48749319115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/revaremimoguxexuwogekufi.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 7

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_off00005298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5298 5404 bytes
SHA-256: af9db757fa03a677796c7babe1fbd58a78a2ab060255ae62e50f2ba66ac3854b
font_01_sfnt_off000064de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 9064 bytes
SHA-256: 377265bf06cdc43f2aefa35d28977558248bfed917896cc9801dfcae1ca4acac

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