Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9870faede8495ed…

MALICIOUS

PDF

39.4 KB Created: 2020-09-09 13:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf2c59e2e3be97483138671bf45918c SHA-1: 5eb286b051034713fc8bda9426a1a53be40c9b0e SHA-256: f9870faede8495edf61994c9e0d9b0f47cb4f78f67cea29a9341b16b7b395992
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.club'. The document body, though partially corrupted, contains the same URL and a reference to 'Saint barbara movie', suggesting a lure. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to obscure the malicious destination or for SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=saint+barbara+movie
    • https://static.usrfiles.com/ugd/c63dba_2fade71111924b9289fb35a577774083.pdf
    • https://static.usrfiles.com/ugd/5899d5_18ec5fbf13704f5985becdfcd3223b2a.pdf
    • https://static.usrfiles.com/ugd/808cd0_82738baca6b54b64b559ac8073541338.pdf
    • https://static.usrfiles.com/ugd/8aba0c_e07140843a8d44b786d4074dbefadf25.pdf
    • https://static.usrfiles.com/ugd/286fb8_9a72df7764994c8ea0c611471c2f7dae.pdf
    • https://static.usrfiles.com/ugd/143c98_3ba75c5d10fc4f69b210650e2d3644d9.pdf
    • https://static.usrfiles.com/ugd/a51aec_90f22e203cf1492883fd9c6f52f1f58f.pdf
    • https://static.usrfiles.com/ugd/3b47cb_20eb494e11d845d883d76595e26dd558.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/tony_hawk_s_underground_2_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1323/files/bhagavad_gita_full_story_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0439/0879/2475/files/58287910452.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/xuxifamajilowimexisil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/mupijulakom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/8546072997.pdf
    • https://cdn.shopify.com/s/files/1/0461/8148/2650/files/56573606037.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5370/files/5097209936.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_off00004768.bin
0768579eede930c690273f73aea96fd863c34ab0776ae761d650aaf7e1db6d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4768 4924 bytes
font_01_sfnt_off00005816.bin
96ea97a64e12d66772cf5031a72fb258843e7967e0dfdb04e648f7cc063ab160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5816 9776 bytes
font_02_sfnt_off000079c4.bin
7ed423fd6f64a2accaab24a388a557cab9318e50e2ef4475c53ca1e35efe0f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C4 16632 bytes

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