Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ab7fcac58cc53e…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 17:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fc87f71e3fd0b23d11bfb05bff1d5a5 SHA-1: 194989a9bbcdc40ce90de98064be7a593e740b0e SHA-256: a3ab7fcac58cc53e50d83c1ca25f2375353d1bfa116b58974acb87f5e3a2d2f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, directing users to a URL associated with malicious activity. The document body, though heavily obfuscated, contains text related to game downloads and the malicious URL, suggesting a lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation to increase visibility of the 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.cc/wix?keyword=undertale+ds+rom+download
    • https://static.usrfiles.com/ugd/b8c837_dde8d2c32830414096a45273f73a64fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cb4107600054da8b5f169b8a7abdea4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0e989ece0c043408877d2cb320f75f9.pdf
    • https://static.usrfiles.com/ugd/3aca14_548e516dcc2a412f8338f57ad4ecdf8d.pdf
    • https://static.usrfiles.com/ugd/12f4eb_04112e738cc84ad58a2845f3e4d985f2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8061/4041/files/96172419552.pdf
    • https://cdn.shopify.com/s/files/1/0435/2462/0447/files/97699484009.pdf
    • https://static.usrfiles.com/ugd/b8c837_d83da753361544a79b60b27f58f047da.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9b01d07d95c4b9e85287a58ed98cc9e.pdf
    • https://static.usrfiles.com/ugd/29c71c_3bf7a807c9184572b5f1d74da0666ede.pdf
    • https://static.usrfiles.com/ugd/2ca09c_efc66344fd364a0891894d01a723589a.pdf
    • https://static.usrfiles.com/ugd/9c43ec_ed2814be145643f69d0348d4860fb9c2.pdf
    • https://static.usrfiles.com/ugd/22739b_a11e5c39634f4412ab4531895b620c05.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_81c58d1b8e6c4f369c2fd3086556d819.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_off00005e68.bin
a9869c43ddd1bc3f32f7307cf87479d533587d39cd49272c24d72c1a8cb97d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 5052 bytes
font_01_sfnt_off00006f91.bin
722a1689ec2984e24ed9dce5b75f075d3d228bcc5cdd17387cedb0fbe98d6aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F91 10296 bytes