Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8906036fb0f29b…

MALICIOUS

PDF

49.8 KB Created: 2020-08-31 05:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6c53d9366a7375480238290ac549e3 SHA-1: b594cd09ff0a4e9a2c14c8e7792cc82d06836659 SHA-256: 2b8906036fb0f29b3916ebdc662c8f1526a836b2692e8a9043366c92add2d0ad
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=ejercicios+de+excel+2013+avanzado+pdf'. This URL is likely used to redirect users to malicious content, disguised as a search result for advanced Excel exercises. The document body, though heavily obfuscated, also contains this URL and numerous other links, many of which point to 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious lures. 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.ru/wix?keyword=ejercicios+de+excel+2013+avanzado+pdf
    • https://static.usrfiles.com/ugd/8127dd_32a678c8ecc34f768fb734f20b317490.pdf
    • https://static.usrfiles.com/ugd/7f929b_d92f58d2f53b4c07a955c631f16b10c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd212668f901423aa76b47aee390d3c3.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/action_and_linking_verbs_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/moxipix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5652/0616/files/waterloo_sunset_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/73590337362.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/menaluvowe.pdf
    • https://static.usrfiles.com/ugd/314c35_01b135720e604c52899827467a075ff6.pdf
    • https://static.usrfiles.com/ugd/696b8a_fa3a1fe237054865a1e9a8f00213b275.pdf
    • https://static.usrfiles.com/ugd/e02969_20900a2a15b54313a8bd37680642caad.pdf
    • https://static.usrfiles.com/ugd/3e9e83_fbaa7a3d885b410ea32f672c7a498051.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af3265543474d41b4bdf191b94d007a.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/suwogube.pdf
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/apple_logo_jpg_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/59457911353.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/10674116678.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000680b.bin
a99bb36f0861d3be15fdfae73b7e05b23fa35d62fa2742b107c38ced9618bfff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680B 5556 bytes
font_01_sfnt_off00007b00.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B00 1800 bytes
font_02_sfnt_off0000838d.bin
a6f9803eb07b0509aeff05468e7e263ecf39efb93a44b876f45bf6d31766b892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838D 11784 bytes
font_03_sfnt_off0000a9cf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CF 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.