Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2379ace61ef7ca0…

MALICIOUS

PDF

40.7 KB Created: 2020-09-01 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb99153c23b87d05dc82ad9450f1bb44 SHA-1: 20c6daaefa4e13bd9691f53b688e839f09c31346 SHA-256: f2379ace61ef7ca07762bd7a31a4331fb870bd27cc5901e3ab8f2c61532f8c57
152 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, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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.com/wix?keyword=mixed+addition+and+subtraction+worksheets+with+regrouping
    • https://static.usrfiles.com/ugd/b8c837_250c8889548e4b2fb66aed7fd1bd1af5.pdf
    • https://static.usrfiles.com/ugd/36f25b_8c61ce17a1424d92872b429a4e95bba2.pdf
    • https://static.usrfiles.com/ugd/0bcf16_994f72f095ec40509df26c4bc72de9b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8db61c4f5e14e4f851e78469309912c.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_828aac8742024817bd81a7d764638aff.pdf
    • https://static.usrfiles.com/ugd/804ff6_df7570ce03aa46aebba4147221f8e8fd.pdf
    • https://static.usrfiles.com/ugd/b916f4_814606f3df584f37870b2a84897966ff.pdf
    • https://static.usrfiles.com/ugd/8ab72e_7c072dce5b0e403eb28ff062f5a211b2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/63739536941.pdf
    • https://cdn.shopify.com/s/files/1/0435/2956/8408/files/star_trek_episode_ranking.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2741/files/61161937612.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/kigekatetexuwodibax.pdf
    • https://static.usrfiles.com/ugd/74c34a_456fc7f567b44151b336b006154a5b0e.pdf
    • https://static.usrfiles.com/ugd/ef253e_d006ead5595346a0bd99631016d41afc.pdf
    • https://static.usrfiles.com/ugd/b8c837_edb5ca1338b24b1cacb339a2cb2623b4.pdf
    • https://static.usrfiles.com/ugd/1b8612_dc2784d8b04040289181eaacab78620c.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_off000060bf.bin
7181ba235ae39d237c15b08b873f7b25a5a4b3ac5ceb4d24083857364b4fa463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BF 5672 bytes
font_01_sfnt_off0000742d.bin
6672422aef3e7bd86f10fe487ebeddadb9d19b650628842f068fecc0affcb158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 9840 bytes

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