Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce5dbff563fed7…

MALICIOUS

PDF

62.3 KB Created: 2020-08-14 23:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b0d45fcd8484dc1c33680db40c32fe SHA-1: ccfe47d7104f6205086b610945bf8785aa660da7 SHA-256: c4ce5dbff563fed73b2cb85374b92b1e7f998e9b1153fcc7a3dbde57d10cadbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=adidas+continental+80+size+guide', is designed to lure users into clicking by appearing as a size guide. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness.

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=adidas+continental+80+size+guide
    • http://tuxiju.pampangahouselot.com/uploads/1/3/1/6/131606881/1642228.pdf
    • http://pogumevek.missionpilgrims.com/uploads/1/3/1/6/131637881/74f8f313585135.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/91479702782.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/assumptions_of_law_of_demand.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/razajesamiv.pdf
    • https://cdn.shopify.com/s/files/1/0443/3759/4524/files/affixes_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/somerurunem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/gizefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/84575358571.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/36983315336.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_off0000b67a.bin
f5f6606e83c6cb74488abea319e60d09cefb70d4f0e4abc2377350e3a4f2e673		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB67A 5384 bytes
font_01_sfnt_off0000c8da.bin
a060fec58ef01a04d6d9e5e0472385d5ce15fc4535546eb2c4f5f6607165fe12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 10396 bytes

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