Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca386a52529c359c…

MALICIOUS

PDF

32.7 KB Created: 2020-08-30 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aa5677c81981dc8acf35c6cee9aa77d SHA-1: b5fc94495dd4d7336f2566b489481ad8c7d2dc24 SHA-256: ca386a52529c359c7846a3b0095d3182da2b042927fc0157d11187f913c85493
154 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.me/wix?keyword=lucie+streaming+vf'. Additionally, it exhibits a PDF link farm, with numerous links to external PDFs hosted on static.usrfiles.com and cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The presence of these links suggests a lure to a malicious website or a phishing attempt.

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.me/wix?keyword=lucie+streaming+vf
    • https://static.usrfiles.com/ugd/b8c837_052f2125847e49058c83956fdea2c9cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b798244337974331a7ca0fb43a6ad61f.pdf
    • https://static.usrfiles.com/ugd/58a813_97db8c9ecc954088bb377665d4a37217.pdf
    • https://static.usrfiles.com/ugd/432b07_9a9a8fda501f40ebbdcc8faabf8cfe76.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/tunepeki.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/28171167290.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/anime_quotes_wallpaper_apk.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2385d517cd24c5f8a47f9ca32f2eb64.pdf
    • https://static.usrfiles.com/ugd/0c4177_227070699a5b444ba909dc401f1c79ad.pdf
    • https://static.usrfiles.com/ugd/a48928_2f8bfe42e6fa41bab3e1f1e572d98580.pdf
    • https://static.usrfiles.com/ugd/d1d005_cba6ef5a20794e8c994312cb52fc2d29.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f625cbcf4794ec5883a050d4165a7bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa60f998f3ca46a0a3a5118adb8edc6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5d8daaeb450400490d06ff4d536ca7a.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_off000043b9.bin
91e1d9b6a2707a8f0fdf27ab032f3d1425f5a0706d066ee244f5163a8f320227
pdf-font-stream PDF embedded font (sfnt) at offset 0x43B9 5172 bytes
font_01_sfnt_off00005545.bin
875e6b1f47cacf5a6ed0045ead1333ddcca968dcf2d18fe25236d4093aa56631
pdf-font-stream PDF embedded font (sfnt) at offset 0x5545 9808 bytes