Malicious PDF — malware analysis report

Static analysis result for SHA-256 a172fbd85b4ab947…

MALICIOUS

PDF

40.8 KB Created: 2020-08-28 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09e6b9113bfdd1a7d9269500aed833a9 SHA-1: 76ab2cb09148d74c50b8e9877252a7cd9c27d743 SHA-256: a172fbd85b4ab947508c394ecb995bfafb0115de3280642e493ddea4b85886c0
152 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous links to other PDF documents, predominantly hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=witcher+3+swamp+thing', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the malicious redirection.

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.cc/pify?keyword=witcher+3+swamp+thing
    • http://files.365downandout.com/uploads/1/3/1/3/131381231/rosapiginaxajir.pdf
    • http://files.socialdeterminantslab.org/uploads/1/3/0/7/130775892/sowuxu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1495/2859/files/the_ailing_planet_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/43848161185.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3149/files/64825869170.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2520/files/zizotevizifem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/mohali_building_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/beachbody_ultimate_reset_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/51734536666.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/lovazafivixazatapilik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/guitar_chords_for_beginners_acoustic.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/the_iowa_infant_feeding_attitude_scale_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/16795735936.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/30517881506.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/wefujewosemoxelaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/ubuntu_to_thumb_drive.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_off00006134.bin
8cce09c9ea8f00240a22d0e95552f5f1a7b216b3db4513898e8a16fb6da165f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6134 5584 bytes
font_01_sfnt_off00007424.bin
ffd36c6e456fc0a992a603c1e94ef883c9ce94e9e9ee8d87ee8c8b2650fe7339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7424 10080 bytes

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