Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c59cbfac30818b…

MALICIOUS

PDF

73.2 KB Created: 2020-08-20 12:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 344fc881e08cf065032280ca15f766be SHA-1: 61f811a66c4550859cd9f7309ee16f4363559ded SHA-256: 71c59cbfac30818b4a155b558e00fa9cd6757c0ebad56ada865d5eef642692a5
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. Another critical heuristic indicates a PDF link farm, with 26 external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to malicious infrastructure.

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=cycle+song++video
    • http://files.timeawaytrips.com/uploads/1/3/2/7/132740296/4126297.pdf
    • http://files.operationalstressrecovery.com/uploads/1/3/1/4/131438216/3314872.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/sedenorogigororabakol.pdf
    • https://cdn.shopify.com/s/files/1/0436/4248/6944/files/ssc_chsl_admit_card_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/0446/0188/files/57710185287.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/dynamics_of_machinery_khurmi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/higher_derivatives_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/jafotubigetadita.pdf
    • https://cdn.shopify.com/s/files/1/0438/5118/6336/files/tisiret.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/wings_of_fire_book_6.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/merusixifix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/72954994101.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/41860471882.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_off0000ce9b.bin
fedc15013cf7e0a58a6178ecf9fa5f4986ed7024f37fb6478c515316448020f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 4868 bytes
font_01_sfnt_off0000df46.bin
ab133c3918533acf0ee99eeb7e08332fe3a6340ebf7b03c4f4436bc7db4d46ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10456 bytes
font_02_sfnt_off0001031e.bin
b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16100 bytes

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