Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efbb2e92ecf2d63…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 08:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced73fb3d4207dbdf62db71d35ffb465 SHA-1: 83a643133a0579a5e3a5a0fb366196e555d028ec SHA-256: 6efbb2e92ecf2d639c9c0c816725a2f9741414e9a6428dc3d1f6d54f48069f25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 24 external PDF links, many of which point to userfiles.com. One of the primary links, however, directs to a known malicious redirector infrastructure at 'ttraff.cc'. This suggests an attempt to lead the user to malicious content, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated.

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.cc/wix?keyword=oh+wonder+body+gold
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0d002d_7c08afe88caf4888a881bfe61e55625a.pdf
    • https://static.usrfiles.com/ugd/eaf48f_6a536b2d6f0c4cd4aed0c8e3d69de7f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb7a68ba40f40898af76c2d6bd1c429.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1b6dd5e34a34c318935621fec93e880.pdf
    • https://static.usrfiles.com/ugd/b8c837_a15e2bb99a464cf48c44de4e05ca7842.pdf
    • https://static.usrfiles.com/ugd/6cfc61_a4b52aef1ce64fd5b3044665cbe09e9b.pdf
    • https://static.usrfiles.com/ugd/2813e2_1e309f7d78be4c15acc1a0b75c93a564.pdf
    • https://static.usrfiles.com/ugd/bb13a2_5c88a7e67f8d4b0b86c4dc12cdfc1747.pdf
    • https://static.usrfiles.com/ugd/cac9e4_c12027ca14de4dd19f5c3161d9119bb5.pdf
    • https://static.usrfiles.com/ugd/09273f_cd52f1329b8e455f824ad65f2a4f972e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ffec7ef8bf841e1aef717cf53b69edb.pdf
    • https://static.usrfiles.com/ugd/70a38d_f9d7e9a50d0c46b498eec3f2f15a93f9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005957.bin
0aed495a8a8a9a063bde5b13f2e2360eb1edebc4d0698ee993076b3a868e5f77
pdf-font-stream PDF embedded font (sfnt) at offset 0x5957 5624 bytes
font_01_sfnt_off00006cb5.bin
172f756b12d2da29945a44e58cd9ea23bd258c0237309fc7ae691811820c124c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB5 5060 bytes
font_02_sfnt_off00007df6.bin
74e95be7b0156c1adf2a7d9aecb40de59dacdc086df2a657f95ce8aae5d0622e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF6 10152 bytes