Malicious PDF — malware analysis report

Static analysis result for SHA-256 a840df56625394dc…

MALICIOUS

PDF

43.4 KB Created: 2020-08-03 23:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 634c9a4fd1ed9a0694856395e2a44d29 SHA-1: f17599866438acd37c5524c2be901f95e51f1b9d SHA-256: a840df56625394dc54b39b84d302ad7fafa875f447599b522a65478d14f816f1
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary links, 'https://ttraff.ru/pify?keyword=comparative+and+superlative+adverbs+pdf', is flagged as malicious. The document body, though partially corrupted, contains references to PDF documents and URLs, suggesting a lure to external content. The presence of a link farm further supports the malicious redirector pattern.

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.ru/pify?keyword=comparative+and+superlative+adverbs+pdf In PDF document text
    • http://files.morinmath.com/uploads/1/3/1/3/131379699/jibuvosuvetu.pdfIn PDF document text
    • http://files.roccasbakery.com/uploads/1/3/0/9/130969405/texelevuw_goraritafapajob.pdfIn PDF document text
    • http://files.barboursvillemoose.org/uploads/1/3/1/4/131453054/lawojuvewotixo_sesaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/difutalusinidamozovumoram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/vapesaremolim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/58178899256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/dapakuxerunug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/25589663667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/nosivediwipeginedumoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/20844085802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/79778632280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0355/1645/files/98096190966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/16386434052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/55951142275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/19341136705.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 5292 bytes
SHA-256: 4252aa5ab019c50e66940b152dad008f746606f57e695b1043e76593a1568abf
font_01_sfnt_off00006fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 10192 bytes
SHA-256: 607dc6a3cf91b228bbd98d09ca9759fbee2e629b3d3db193962259877f17cf83
font_02_sfnt_off00009289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9289 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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