Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98087ac81e666a4…

MALICIOUS

PDF

112.0 KB Created: 2020-08-26 17:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a4f10c345797f967609c54451c25d6af SHA-1: a159f79f03fbf6df7138ca1af7f11263968cc7bd SHA-256: b98087ac81e666a413ab480848c979576f9caf7b74cdea328b7f419d8980dc9c
234 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a download for 'Mortal Kombat 11', which redirects to a known malicious URL. The document also functions as a link farm, containing numerous external links, many of which are SEO-optimized. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://ttraff.ru/pify?keyword=mortal+kombat+11+free+download+pc.
  • 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.ru/pify?keyword=mortal+kombat+11+free+download+pc In PDF document text
    • http://files.tranquilsoundsproductions.com/uploads/1/3/1/4/131409508/e4cfe59d50b1a.pdfIn PDF document text
    • http://files.carriagehousecinema.org/uploads/1/3/2/6/132695258/tarefobako-mizuvowomoxevex-lufetuzivo-sanupitixijur.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/1/0430/0832/7829/files/adb_install_apk_error_device_unauthorized.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/23501163490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4319/0944/files/fit_body_boot_camp_workouts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/zisosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/kirotasuruvizolofabin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/taylor_series_expansions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/66381222179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2717/6343/files/zidudaluf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1276/3298/files/adobe_acrobat_reader_leitor_e_editor_de_apk.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 5

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_off00017b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B02 5476 bytes
SHA-256: 2aaf074e6a36270afb248758e03508cadb9ff0dc29edcf84ab5df1175acacce2
font_01_sfnt_off00018dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DAD 11180 bytes
SHA-256: 05c160174f17505081e30a39192ab2333563cc8e62a8b502301e928c7ffbfe40

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