Malicious PDF — malware analysis report

Static analysis result for SHA-256 836786a272b2e8ef…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0608d59b3350b513c50703bc455405 SHA-1: 714e18f18d2f4d50ac6faf897b7e6cf12aba7afd SHA-256: 836786a272b2e8ef065b6f8e9a0a9a1c5d976e9268db7c5c967132363f0ed15b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to 'future simple active and passive exercises', likely a lure for SEO poisoning or phishing. The presence of embedded URLs and the malicious redirector strongly indicate an attempt to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=future+simple+active+and+passive+exercises+pdf
    • http://tiniv.ckpinkinvitational.com/uploads/1/3/1/4/131453501/4efbf9282033af8.pdf
    • http://files.rhlab.org/uploads/1/3/1/1/131163533/fonor-zumikobirox.pdf
    • http://files.adambagleyillustration.com/uploads/1/3/1/3/131379340/zoruw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4499/5221/files/3964595070.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/56788087206.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/gitadozaxovipoxezirexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/37426250704.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/soundtoys_native_effects.pdf
    • https://cdn.shopify.com/s/files/1/0433/8771/5742/files/87838127867.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/30338624286.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/kedimezedizomavufuki.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/85414643513.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/32565503822.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/17920645591.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/40257849323.pdf
    • https://cdn.shopify.com/s/files/1/0437/3728/4762/files/19919652307.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000501c.bin
2706d93cca15fa962451dfef8a72af9eb4e52eefeff4dccc55706996fa8ab59e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x501C 5156 bytes
font_01_sfnt_off00006192.bin
230d18b987d9290421cd7851cc08ff185e8b97633d21aee55af381d04cd6e8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6192 9984 bytes
font_02_sfnt_off000083bb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BB 4324 bytes

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