Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc55539a73868e8…

MALICIOUS

PDF

41.4 KB Created: 2020-08-29 21:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46dd73ee4af0cfdc7899c25aa763ca54 SHA-1: 0fb840712f41363372228c11f4ef59a376a69720 SHA-256: 0cc55539a73868e8428cc3ae68a177f81005d45ece76579f6936c94dcd17f541
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=2011+mercedes+sprinter+wiring+diagram, which is likely a lure to entice users to click. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=2011+mercedes+sprinter+wiring+diagram
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5084/1750/files/77615386863.pdf
    • https://cdn.shopify.com/s/files/1/0437/0418/9096/files/24379793112.pdf
    • https://cdn.shopify.com/s/files/1/0449/0487/4151/files/pijomekumifojima.pdf
    • https://static.usrfiles.com/ugd/b8c837_65e21b207f954b5aa20bf575f0bf44ab.pdf
    • https://static.usrfiles.com/ugd/accd1f_ceea03592c0e4be2af9196f8f0fb22c9.pdf
    • https://static.usrfiles.com/ugd/22739b_cff9c5aab2814345bf8a3949a3f91d6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d7cf7449f994085882a662e3ea1e713.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fac8b22f7e44a8093401ab03043d3a5.pdf
    • https://static.usrfiles.com/ugd/3cb679_9d8ff0561c94450da02e7a37030c710b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcf3dfdbe8d142f7a2f21ac2f973041f.pdf
    • https://static.usrfiles.com/ugd/f0e51d_7a0b4e882f5f437e9c6bd6d2b237eed6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b122d1407784170ad390c36a3b2e51e.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_off000062a5.bin
ab6aba79887bb6f4d490db25835b31dd2577b30706aab545573bbd2385666ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 5684 bytes
font_01_sfnt_off000075ef.bin
da52b84be05d73a5c26dea7bd83aa18864239f42f040b87676441a805bb4674c
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 10136 bytes