Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e559b9376985ec…

MALICIOUS

PDF

45.7 KB Created: 2020-08-29 18:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa7aade05b2a91ea13c3f07cd1885a8 SHA-1: caf32fdca973614975c2913675ca996af9191293 SHA-256: b2e559b9376985ec90b95072e5026762089e41dd229ae811940ca6f916d5c393
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a link farm with numerous external PDF links. One of the primary links, https://ttraff.ru/wix?keyword=casio+pathfinder+pag240+manual, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it's a key component of the attack. The presence of a link farm indicates an attempt to distribute malicious content or phish users.

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/wix?keyword=casio+pathfinder+pag240+manual
    • https://static.usrfiles.com/ugd/b8c837_74e3707b6826426d9c56d050c3e0849f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c5c661847a24ede85af15664830ebeb.pdf
    • https://static.usrfiles.com/ugd/913720_455a56ef85e84ce491642872d68a40ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_c49ec4f356cf4433a1fe6ccd20c323c1.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/4867179705.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/90680522424.pdf
    • https://static.usrfiles.com/ugd/b8c837_e934b1eb7db94ee79e3b7e0d26bc9e27.pdf
    • https://static.usrfiles.com/ugd/affaa6_0f6152dcc56e4172ae8f288bce7a6fb6.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4805/files/power_king_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0447/7861/9029/files/34494875460.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006955.bin
b954f47c1c36665e64ffda5914c34a047eab27177808523c982b31bd88df63e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6955 5724 bytes
font_01_sfnt_off00007ca0.bin
544b4ef1072d1b38a55370a3256e0193208966cca32f609873475661bfec51f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA0 14656 bytes

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