Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba37c4cd4b5ee9c…

MALICIOUS

PDF

47.6 KB Created: 2020-08-02 04:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c2d4a05c6e0b28ae8eecfbda10dfbdc SHA-1: 025f30919705cb6e68119a429da8f271afaf8627 SHA-256: 0ba37c4cd4b5ee9c2f4068cf402ec126feb7ced18d10b2926c139e973b5377bc
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 PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=viva+la+vida+guitar+chords', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially 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=viva+la+vida+guitar+chords
    • http://files.jonathanbrooks.net/uploads/1/3/0/8/130813965/guropasodelofon.pdf
    • http://files.arborparkpto.com/uploads/1/3/0/7/130776861/2de498092a69a.pdf
    • http://files.alekstinapoodles.com/uploads/1/3/0/7/130776519/4314976.pdf
    • http://files.hhseyeofthestorm.org/uploads/1/3/1/4/131452823/7b966bbf72931.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/61010307935.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1254/files/teropexuxon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/bufogowusomawug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/82679571643.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/50964887075.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5215/files/introduction_to_computer_security_goodrich_tamassia.pdf
    • https://cdn.shopify.com/s/files/1/0430/4053/8773/files/97475217689.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/ligejovixeri.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/20210892545.pdf
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/48888708937.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/repisumefenot.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a6a.bin
4cd73e00681ff2873ff9183e2e943dedbe34b40b52dfd58fe0ce9f6ed193e510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 5224 bytes
font_01_sfnt_off00006c33.bin
ee0530304f4f6309076d229984a6217cfe746d229104751d6bc72b0131400ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C33 14628 bytes
font_02_sfnt_off00009a0f.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0F 16204 bytes

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