Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fc9e4182ff1b7b…

MALICIOUS

PDF

45.5 KB Created: 2020-09-28 18:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01692764be0bb0a8e6a61377ba454a9c SHA-1: 0e03c450c2b04a016569a74bb9f41bfa380979a2 SHA-256: b7fc9e4182ff1b7bac27a29d365825e7848318ad48f44df39b8c95d93ab2b384
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to artificially inflate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body itself is largely unreadable binary data, but the presence of the URL 'https://ggtraff.ru/mozel?keyword=applied+multivariate+methods+for+data+analysis+johnson+pdf' within the binary stream further reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/mozel?keyword=applied+multivariate+methods+for+data+analysis+johnson+pdf
    • http://sesuwuraz.eswbrg.org/uploads/1/3/1/3/131379803/kolazatotuzir.pdf
    • http://files.gelc2020.com/uploads/1/3/0/7/130776133/b8fd654d27652a.pdf
    • http://files.texasumbra.org/uploads/1/3/1/4/131409309/3025180.pdf
    • http://kugivivog.ritecookware.com/uploads/1/3/1/4/131453960/f43badd.pdf
    • https://site-1036880.mozfiles.com/files/1036880/gosakiratolimakedalagufe.pdf
    • https://site-1036803.mozfiles.com/files/1036803/sajugibotedobo.pdf
    • https://site-1036649.mozfiles.com/files/1036649/vubedulipokafizepipozeta.pdf
    • https://site-1037177.mozfiles.com/files/1037177/71267457801.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/99168683795.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/specified_platform_toolset_v110.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/d_d_rapier.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/best_books_for_young_adults.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2981/files/pezovibusanumupowiben.pdf
    • https://cdn.shopify.com/s/files/1/0482/0566/0312/files/98078746267.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_off000070af.bin
dd8f602c3d2209cf891c0bcf22f616e88834a104f29eb0abb846229838ec5c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 5508 bytes
font_01_sfnt_off00008355.bin
78b30ed0080fc94c3cfcef4ed28ac24ebdeba004334c96d3d7a1a82c5977805c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8355 10912 bytes

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