Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f7fd228e767cb1…

MALICIOUS

PDF

43.7 KB Created: 2020-08-25 13:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aaebc72eca5d138a20ae4faf474d397 SHA-1: b59a484df694a266ceeb2a1db0b3a6a14640449a SHA-256: 86f7fd228e767cb11f912b8b408360977513240ddbcdb3e9c731368023483755
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is likely the primary malicious payload delivery mechanism. The ML classifier strongly indicates maliciousness, and the document body, though obfuscated, contains the redirector URL.

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=20.+2+adverb+clauses+practice+1+answers
    • http://files.eugeniaforteza.com/uploads/1/3/1/4/131406403/janusojoruxamewose.pdf
    • http://files.archikal.com/uploads/1/3/2/7/132740250/18effd9cba2d8c7.pdf
    • http://xitexefi.pollyadamssutton.com/uploads/1/3/2/6/132681495/xoxixuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2496/files/sudinonimaxog.pdf
    • https://cdn.shopify.com/s/files/1/0434/8228/4194/files/digital_marketing_manager_cv.pdf
    • https://cdn.shopify.com/s/files/1/0438/9565/2504/files/mudafuwon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/ayyappa_telugu_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/antagonismo_no_competitivo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0764/5595/files/research_methods_in_behavioural_science.pdf
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/55833121988.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/different_types_of_topology_in_computer_networking.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/wemuledadanam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/nowosuxegobofa.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_off00005f39.bin
b6a28b75376a896edb7aa2f449c186181647ae521fc60925f450a6edd1f1eead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 5392 bytes
font_01_sfnt_off000071a5.bin
c545425f2090895505157ab77740b9a3e889b4264acdac919fb2158786523dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A5 9980 bytes
font_02_sfnt_off000093c6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C6 4324 bytes

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