Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b9f98bd4ac398a…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 19:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ef31a8bd7ff210e431b14e25fe943fe SHA-1: 84727c1ba3addb262fc256aab7d87176ec7b8b81 SHA-256: 08b9f98bd4ac398a71430f7d9fa43f92ed324d2d6524ad728f7ca6dfedf2b4fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a job description and the malicious URL. This suggests a phishing or malware distribution attempt where the user is tricked into clicking the link, which then redirects to malicious content. No scripts were extracted, but the presence of embedded URLs and the malicious redirector link strongly indicate a malicious intent.

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=workshop+facilitator+job+description
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3f4b99_c54bc3027fce4948bf743f6a9de75460.pdf
    • https://static.usrfiles.com/ugd/b8c837_681f2cc7fc5c4ddc8bff164975e67588.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e97ca742095433ca6b4e60f8d16cf3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e67156b404d4e84b9a943e3778bc25e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a5556bc64c6445db763bc5047ee6aeb.pdf
    • https://static.usrfiles.com/ugd/6290de_6413294b2ffc4ffaa053d76500d90511.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a7c8bbcd9bd4834aa70780b5158fb8d.pdf
    • https://cdn.shopify.com/s/files/1/0444/4746/5639/files/can_you_custom_apple_watch_faces.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/tukifuvufuvu.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb28dda2c08d462290a8804f671fe9d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f4f84a6a05a415fadeb236f94690782.pdf
    • https://static.usrfiles.com/ugd/b8c837_84a0b93aa568496e8e1fa3454ffecf22.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae35ed7916854a75a8d80562f6633295.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006159.bin
97c0f3f1b8a627a7183cca81a1eedb9806935e557682e04e339b3e2738107cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 5536 bytes
font_01_sfnt_off0000742f.bin
7b8861776f5a6db60438ed07b67082558bcee43f953a9f7fd659ccd35ef181bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x742F 10688 bytes