Malicious PDF — malware analysis report

Static analysis result for SHA-256 237194221d80498b…

MALICIOUS

PDF

80.0 KB Created: 2020-09-10 10:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d70603170920a955a2351b98569e998 SHA-1: 61c37b0ac7b1b89e9ff7ed59afd94042dfef1ab6 SHA-256: 237194221d80498b001fb0dbcfe6e21b08c238ed90b3cf215a65c37af262f361
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wb?keyword=binomial%20distribution%20chart%20pdf'. Another critical heuristic indicates a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0430/5007/4269/files/widaxexabigubiximibew.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting a lure to a malicious 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.cc/wb?keyword=binomial%20distribution%20chart%20pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/widaxexabigubiximibew.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/98336279004.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/gikegilenamedomoled.pdf
    • https://cdn.shopify.com/s/files/1/0447/0548/0858/files/95016822901.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/types_of_taxonomic_characters.pdf
    • https://static.usrfiles.com/ugd/d162e3_f266e568f74b4e9090b466379bbbdef3.pdf
    • https://static.usrfiles.com/ugd/469aea_82173133c63b4b7bbb95cf8fb4beafae.pdf
    • https://static.usrfiles.com/ugd/5b9365_5e003753c9b4459a87e94ba6ac841915.pdf
    • https://static.usrfiles.com/ugd/90d19e_9c18de70672b49d2bb90f05df7fab7a7.pdf
    • https://static.usrfiles.com/ugd/145364_fa3c88f7ea08415393136495c73c1e05.pdf
    • https://static.usrfiles.com/ugd/d6b5da_3636c586b71c4d83ba938037b9d353d4.pdf
    • https://static.usrfiles.com/ugd/86319b_c7599afdf17c4c788136e85b808edcc2.pdf
    • https://static.usrfiles.com/ugd/79cb75_2992403655004abc824d646ae5e45ae5.pdf
    • https://static.usrfiles.com/ugd/622218_a439513739ca43158cb8e257e5421792.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c129ede45344c8f9c428e1332799957.pdf
    • https://static.usrfiles.com/ugd/6e3131_65749643f9d54e9a90e9d71a8c62a15e.pdf
    • https://static.usrfiles.com/ugd/40512e_1a5768cc72c24c5189b706084bdf6093.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_off0000e6b1.bin
b677ed7da2d3406d566b5963bc0ac7746f65707b6f492ad057688b61d052df1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5348 bytes
font_01_sfnt_off0000f898.bin
8bfe61d54c43eadb1864385121dd4e244613d89a512686cd2b4d625ae709a098		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 13828 bytes
font_02_sfnt_off00012481.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 4324 bytes

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