Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eb7faf904359aa…

MALICIOUS

PDF

42.2 KB Created: 2020-08-24 12:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56d5002c4289413c763009a17b0985d SHA-1: 4e2c511db3dff3dd32c89ca89a63f2d190b16cca SHA-256: e4eb7faf904359aac73e5dc9d75346702189751ee4a3ecf0a3e3ff36f3f808c6
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of a link farm containing numerous external links, with one pointing to a known malicious redirector. The document body contains obfuscated text and a URL that appears to be part of the link farm. The primary attack pattern involves redirecting users through the malicious infrastructure at 'ttraff.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=yahoo+search+engine++for+mac
    • http://zemepo.kyocreations.com/uploads/1/3/1/8/131856214/zudumazesagib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5187/files/protocolo_test_de_raven.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/55192562777.pdf
    • https://cdn.shopify.com/s/files/1/0448/4002/6273/files/cutting_edge_intermediate_resource_bank.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/lirezix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/73011153529.pdf
    • https://cdn.shopify.com/s/files/1/0446/3312/9123/files/sql_server_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/bad_bunny_songs_mp4.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_off000065f1.bin
a33260c5254ec6406b236558734a744705fe6729229dbaa84f297ad7ca39142f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 5224 bytes
font_01_sfnt_off0000778e.bin
4bb84aa671806a79f67ed643e4fb63341a3d03039e99f8220d528543a7db427a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778E 10968 bytes

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