Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9a05041c60882…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c947ce0d5f84d4075e65150c37bac4d2 SHA-1: e2d6275e94c117c0dbb52ef9b2dbe357a8696e7c SHA-256: b3b9a05041c60882c813b18b92f22d751e8d3ae8fe1c3fbb95dcb53ac362b0ec
152 Risk Score

Malware Insights

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

The PDF contains a link to 'ttraff.ru' which is flagged as a malicious redirector, disguised with keywords related to a game download. The document body, though heavily obfuscated, contains the same URL. The PDF also hosts a large number of external links, many pointing to 'static.usrfiles.com', suggesting a link farm or redirection infrastructure. The ML classifier strongly indicates 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.ru/wix?keyword=joygame+zula+indir
    • https://static.usrfiles.com/ugd/fd3290_7a2e29aed2f748e38256de441c6f2aca.pdf
    • https://static.usrfiles.com/ugd/7dd30d_0fd00de693804230bcfc508d2913b89f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a491572542ef42c1947d8db075ac2291.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/dosakijirabavomezazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7351/files/field_crops_and_cereal_production.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6715/files/32669980349.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/security_risk_in_cloud_computing.pdf
    • https://static.usrfiles.com/ugd/0c41e7_13445972c936480e8709fd1da640302c.pdf
    • https://static.usrfiles.com/ugd/c8a981_0ef7ef6d05f54a11bd942139f4e57827.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bcecb7d8fdf497e9ad313e42fbafd4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1edcb8a83c94dfea2c829b95e17ac54.pdf
    • https://static.usrfiles.com/ugd/7ff653_655ef01fa35543088e05a3cb08e5107f.pdf
    • https://static.usrfiles.com/ugd/b8c837_70b90524175f4fe5af076053114ba32e.pdf
    • https://static.usrfiles.com/ugd/191a6d_baefdc89949e4a9397037403a64cf834.pdf
    • https://static.usrfiles.com/ugd/b8c837_0265392217ca4d0c9113f8cf1b3a9dd3.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
font_00_sfnt_off0000600a.bin
5459d5165094077ca5bb37d177687e65e9bcaf7f625a4768adbeb5527c7bbf12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600A 4912 bytes
font_01_sfnt_off0000709e.bin
52c9fda257656d55b2b804a7637ffd24e8e853f6dd371bc172fe9734668b3188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 12620 bytes
font_02_sfnt_off000097b2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B2 4324 bytes

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