Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ff83d3da0b0fa2…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 00:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8bd4b5251a0316a47ff5e7aab7895f31 SHA-1: 3febd600e214c0b3fbfc9f96870fcced6f9f7248 SHA-256: 21ff83d3da0b0fa22ecd0d08b91f76b3b28e50a277c45de41b444d264e855f89
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is part of a link farm designed to attract users with keywords like 'gta v android aptoide'. The document body and embedded links further support this by providing a URL that leads to a PDF file, likely intended to trick users into downloading potentially malicious content. The presence of numerous external PDF links suggests a coordinated effort to distribute content through SEO manipulation.

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=gta+v+android+aptoide In PDF document text
    • http://nuxuni.lambersfisher.com/uploads/1/3/0/8/130813453/pajurireduvobed.pdfIn PDF document text
    • http://files.peoplematteralways.com/uploads/1/3/1/3/131398605/647907.pdfIn PDF document text
    • http://files.huntingdonbedandbreakfast.com/uploads/1/3/1/3/131381799/fac38.pdfIn PDF document text
    • http://files.monaconsulting.com/uploads/1/3/0/7/130775174/bebabuxavo.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/1/0433/4800/0922/files/42988493267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/mark_fisher_ghosts_of_my_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3742/5813/files/dumukubodapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9037/8909/files/81534859690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/riguxobobimaxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/88831541849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/nusolajoredezuzolom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7742/5565/files/oxigenoterapia_anestesiologia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/little_helper_osrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/27607831088.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_off0000592e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592E 4832 bytes
SHA-256: 08cc56d968c0882fae8f520429030334992a0fe3da40b206550c71360d6d7faf
font_01_sfnt_off000069b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 11212 bytes
SHA-256: c74f76fa857b6cae20e6a43fb04c6f909bc8df3c61be8b3f8fba9f486c4a3383

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