Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32c95ac521ace37…

MALICIOUS

PDF

48.0 KB Created: 2020-08-31 19:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269a066a1cf75f5055d0a108471c55af SHA-1: 839ffa98f39a6e786bc7a5222f46ec40f9c5c7f7 SHA-256: c32c95ac521ace3728dff44f525ac8ee103b986606ea74b40c8fd2b262880f8a
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the redirection chain. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a phishing or malware-hosting site.

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.club/pify?keyword=jio+store+whatsapp++now
    • https://static.usrfiles.com/ugd/b8c837_86fce33d88d24af9b0187d99524497b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ab62e2ed9c4746bce29bbd0a9a6965.pdf
    • https://static.usrfiles.com/ugd/289c5e_658cacd3df1f4eeb8968deea5f9ff4a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a487ad2d96e4df2949d3a1a9a78f803.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc4d593d89d3458f8c6ce36337143781.pdf
    • https://static.usrfiles.com/ugd/95089d_f7c4f2b42f9048e784276d471aa1719c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/kujanuxuniriwodaxujanepon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/64358666030.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/essentials_of_functional_foods.pdf
    • https://cdn.shopify.com/s/files/1/0440/1440/3742/files/sotepapajuzebewalig.pdf
    • https://static.usrfiles.com/ugd/21e6f2_5225fc2cab614a71ac076f17c75a22ed.pdf
    • https://static.usrfiles.com/ugd/0df15e_3d5ffe5ebbef44b5828a0d48209cb5cb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009725.bin
95c60b3e6d9191d86e0d405fff5dd62f55c70cad4ce95d03b32225ed0dae05f6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9725 18152 bytes
font_00_sfnt_off000063dc.bin
44939cfc726adfa630f1366061943ee3c7f24a241c5630b472801b9f65d31a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x63DC 4956 bytes
font_01_sfnt_off000074c3.bin
69cab65577507c8fb6590169dd66e5fa8ea4232c75e5ebb34398db71eaffc961
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C3 9980 bytes