Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b33abca083503…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 18:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 188bf5078b823f09f99c954d785d68c7 SHA-1: ee50739d5d172c4575c8dcb966815d4ce32d4d65 SHA-256: 5d9b33abca083503089b7a88a18a1d7f49a83d6b97937653ddae5ddef729d349
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'. It also exhibits characteristics of a PDF link farm, with numerous external links. The document body contains the malicious URL, suggesting an attempt to disguise malicious content as a legitimate PDF summary.

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=shintoismo+riassunto+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/setinekazovifilibajisib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/95439156426.pdf
    • https://cdn.shopify.com/s/files/1/0461/6739/2419/files/rarubefujupope.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe740756e4745bbb9da2d2cc664978e.pdf
    • https://static.usrfiles.com/ugd/fd30ac_d46f4fa85e06492da1796196dc659e1c.pdf
    • https://static.usrfiles.com/ugd/09273f_6660d370e44749b383f36961fd8a7084.pdf
    • https://static.usrfiles.com/ugd/0d9a50_cdb72651569247d4985f501e89a2e502.pdf
    • https://static.usrfiles.com/ugd/ca32a8_18068ec536fd4ebe9e9eecd183b43b53.pdf
    • https://static.usrfiles.com/ugd/b8c837_be7e26099c5243aa8b9e799859944a25.pdf
    • https://static.usrfiles.com/ugd/f09a9d_0ece2dfe9b954fbb8ba7096111f4354f.pdf
    • https://static.usrfiles.com/ugd/9b5f63_9900ae300cf742d9a52c7efb489f8f24.pdf
    • https://static.usrfiles.com/ugd/37321e_ecff12e98608473d89ba82f0cbd76be2.pdf
    • https://static.usrfiles.com/ugd/b8c837_df138d8e91464135ba6ad496f8f6ca03.pdf
    • https://static.usrfiles.com/ugd/ddb60a_b6bb347767664be2bafae883251c368b.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_off000068fa.bin
8f7b8feadcc78fddd7d87daf62ef7602a9cad5e9ee5b99baee1e228a5b86826c
pdf-font-stream PDF embedded font (sfnt) at offset 0x68FA 5352 bytes
font_01_sfnt_off00007b01.bin
c084e78f41a4dacc3089c2fe60f7ca3a68e444c1da801a0fa6d09cb3a1ca292a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B01 10932 bytes