Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54b2638066f4b22…

MALICIOUS

PDF

36.9 KB Created: 2020-08-21 19:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cce8a4402175423e6a060e479a341c8 SHA-1: 0d436ebf2cdeab73a373db606d9e16762e31badd SHA-256: e54b2638066f4b222d8ce858a1352a8ea1318e31c8f81a93986fa35cfae9e32a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a high ML score and the presence of a link farm containing numerous external links. One of these links, 'https://ttraff.ru/pify?keyword=shake+it+up+music', points to known malicious redirector infrastructure. The document body contains obfuscated text and multiple URLs, including benign ones hosted on Shopify and a potentially malicious one on 'folawime.diolicovid19.info'. The primary attack pattern appears to be a link farm designed to redirect users to malicious sites.

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/pify?keyword=shake+it+up+music
    • http://folawime.diolicovid19.info/uploads/1/3/1/4/131454106/3157395.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/gisodogalelejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/48451760294.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/52140291854.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/40563848860.pdf
    • https://cdn.shopify.com/s/files/1/0435/2602/9463/files/lightroom_keyboard_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/30135868758.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/679_fetty_wap_ft_remy_boyz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/53008832786.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/pugifesasugadakunametaro.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/47346719279.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/55137880632.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004333.bin
53b2ae65f4f24cdeb89500ad734566cb2d4460f45ca01fd55ff0e39d41034ff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4333 4880 bytes
font_01_sfnt_off000053cb.bin
3f9dd370cb1a3a018e9df0cc83c73e61b2666cd58c3d99017e4c446c86eeb23c
pdf-font-stream PDF embedded font (sfnt) at offset 0x53CB 10960 bytes
font_02_sfnt_off0000793c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x793C 4324 bytes