Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3dfd6e88aa168b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 19:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2010fda00bfde0d0469143c0a36cdb19 SHA-1: 1383866c91a87e2d7de07793a051ad9a5c268b38 SHA-256: bd3dfd6e88aa168bf710b9573e83c8ad96f10f71cae248630a24b183ae5b4253
154 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 'https://ttraff.ru/wix?keyword=identifying+types+of+irony+worksheet'. This URL is embedded within the document body, which also contains garbled text alongside the URL and references to 'wkhtmltopdf'. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', suggests a link farm or SEO poisoning attempt to distribute malicious content. 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=identifying+types+of+irony+worksheet
    • https://static.usrfiles.com/ugd/34ec99_b4c1785f5a934590b74fa6d274ed41da.pdf
    • https://static.usrfiles.com/ugd/8de238_1bf0c052c85c4e58af47bd63693f60f5.pdf
    • https://static.usrfiles.com/ugd/516793_450e460cb7814a268ef188d657cc99f6.pdf
    • https://static.usrfiles.com/ugd/a86d68_8dce934a17a74816ae5b95531c175b09.pdf
    • https://static.usrfiles.com/ugd/d01287_42e8701e5a4742df99d7b79d432d71c0.pdf
    • https://static.usrfiles.com/ugd/b77b08_c9f93cebec2b4913b563d18527fbc40c.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/xotarotinajodixitew.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/kanazepokipopufubenuxitim.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/vidopebebenotufesixib.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_off00006efd.bin
a3b92ffd8fa7c54b1a41c6a5d9ac86754399494b400380bdd2fba5e787049f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 5256 bytes
font_01_sfnt_off000080f9.bin
e39bb73917bee3edbabdb37c4286e1f9acc2525a1d77d70252b5778930ffa483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 10428 bytes

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