Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615e39a73650d98…

MALICIOUS

PDF

38.3 KB Created: 2020-08-16 14:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b6bf23f5c5fdfab4b27056507b6bef40 SHA-1: 077e314c7f66a74cb3867b5ffa949ba6f57684d8 SHA-256: 8615e39a73650d9827f8f671dd159b4582ec58abe09899b95a6c0741e0e4cc49
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL that masquerades as a chess game for Android, aiming to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the embedded URLs point to known malicious redirector infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=chess+game++for+android+apk In PDF document text
    • http://bagizu.thepatchworkunderground.com/uploads/1/3/0/8/130814788/gogedunaxunefikuroko.pdfIn PDF document text
    • http://files.juniperlactation.com/uploads/1/3/1/1/131164358/65fe128.pdfIn PDF document text
    • http://files.rifg.org/uploads/1/3/0/8/130813362/74ecc7addb38076.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/1/0440/3943/8486/files/95852421003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/kifekolem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0513/8328/files/manual_hydraulic_hose_crimper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/64488397943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/manualidades_con_cajas_de_carton_de_leche.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/84516386332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0564/8791/files/57537838577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/veranuxeruval.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/69372133701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/43192430368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/xafon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/60305526146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/the_human_mind_book.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 2

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_off00005728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5728 5392 bytes
SHA-256: b03e0ee61e4c6fcff0809e6383efc491fad7426415bfac15f646ce46e4f84041
font_01_sfnt_off0000695d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 10216 bytes
SHA-256: 5d74787c588c18967c0380d71a5b71069b6693c8193bb6b2d2cad4c2b83cd6fb

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