Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f55d242ee7f6be…

MALICIOUS

PDF

58.5 KB Created: 2020-07-30 12:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d5b56004a0ed504196935de22b009185 SHA-1: f01766e31feafd4f6390ecbcca2856d2c86b9093 SHA-256: 73f55d242ee7f6bea97197d4016d4732018b8a22172e3f32f3166cbbf840fabd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to an SEO redirector, specifically 'https://ttraff.com/pify?keyword=fide+rules+of+chess+pdf', which is flagged as malicious. This suggests a phishing or scam attempt, likely using the 'fide rules of chess pdf' lure to entice clicks. The ML classifier also strongly indicated maliciousness.

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=fide+rules+of+chess+pdf In PDF document text
    • http://files.1zion.org/uploads/1/3/0/8/130874077/1edc3ad2e472b97.pdfIn PDF document text
    • http://files.dlitefulchocolat.com/uploads/1/3/1/4/131453493/nimojixofarafa-kokubek-mujefukogezevip-kagunuwefo.pdfIn PDF document text
    • http://files.sasksws.org/uploads/1/3/2/6/132680808/1133427.pdfIn PDF document text
    • http://files.royalsunset.to/uploads/1/3/0/8/130873961/miferorulofijaf_rafigosojiz_wofiwesedolim_fanorupir.pdfIn PDF document text
    • http://files.cristinavannel.com/uploads/1/3/1/4/131438501/gawimakated-pijisojoromowom-masikodiben.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/1/0428/9835/8432/files/33374625424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/bapod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6634/3072/files/vaziroveketawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4592/0669/files/44273225437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72966212333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1060/4705/files/kelasalenot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/43979358544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/jopagujuzulazekojuwido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4616/4897/files/93778936529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/27000585537.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_off0000ab32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB32 4684 bytes
SHA-256: 45cc5912c89243480fa05fcaebfb2f19b9e09ae61d468b31d567dacfdad8f882
font_01_sfnt_off0000bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 9880 bytes
SHA-256: 02575383ce5e2b078be3f41a0a9d583d1ce55c0f62ed6417150f2fced05ea43e

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