Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdefe566a49d5bf8…

MALICIOUS

PDF

46.7 KB Created: 2020-09-11 02:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3685c0af34e81daa2d68cf9baa00700c SHA-1: a36c5c2a8057d96715e01e29e2bf6ad7d88ad8d8 SHA-256: cdefe566a49d5bf81c31770b675ae33792425ddbb50af8400f5d335c98a2cf04
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.link/wix?keyword=andreas+vesalius+biographical+information'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the redirector URL and references to biographical information, suggesting a lure to a malicious site. No scripts were extracted from this sample.

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.link/wix?keyword=andreas+vesalius+biographical+information
    • https://cdn.shopify.c
    • https://static.usrfiles.com/ugd/35c6e2_a3508ed858e94eed8cdfaf615817f8b3.pdf
    • https://static.usrfiles.com/ugd/027f51_ac525f0f8ee24a93b5c664a76b59449d.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_429500a88be14efcab25dcfa62346827.pdf
    • https://static.usrfiles.com/ugd/ab63e3_bde33b7486ce468eb0bdfb45126f0661.pdf
    • https://static.usrfiles.com/ugd/52b593_248ae620bf994dffb0a43512b36d7240.pdf
    • https://static.usrfiles.com/ugd/7baf93_9a5a352d47a740778776ab44dcf020e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_4af9eb89322e4993b53d847c86203bd2.pdf
    • https://static.usrfiles.com/ugd/d954c5_9eec2eb6649c4f5a925c73d21c11bbf0.pdf
    • https://static.usrfiles.com/ugd/8bf3fc_376be83a304d491088672b8ea1188e69.pdf
    • https://static.usrfiles.com/ugd/45e30f_716cd070a2824b2b87282be87ff49329.pdf
    • https://static.usrfiles.com/ugd/bc0b97_bad5417726bf4e3f912faac74b55430e.pdf
    • https://cdn.shopify.com/s/files/1/0472/3313/8853/files/gana_prabha_biriyani_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nipexaledova.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/paper_bag_princess.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/92541513848.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_off00007779.bin
e896df424815c0ce5ec2c375fe05a45ffd3d1ff0b5d9864d62862aa5d364a990
pdf-font-stream PDF embedded font (sfnt) at offset 0x7779 5756 bytes
font_01_sfnt_off00008aeb.bin
7b184289e1458e3ab2b4db4b81d2c012d74b715c0e0338a173f2edb0a08bccd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEB 10072 bytes