Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e99d449c2b58c9…

MALICIOUS

PDF

37.0 KB Created: 2020-09-01 21:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c6f011b2632e697b8a785f05874034 SHA-1: 78ad71fa463538f5ceff4a8fef08661a1d1def58 SHA-256: a0e99d449c2b58c9098ef7477a569aa6808455dac18588faed82d1f71aa47a30
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also flagged the document with high confidence. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, limiting the analysis of direct payload execution.

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=film+like+a+brother
    • https://static.usrfiles.com/ugd/9b33c5_1faf1898744042d5bd480c0de6b8b438.pdf
    • https://static.usrfiles.com/ugd/b8c837_db0f21ed758f4bd0b9a393ee819e4285.pdf
    • https://static.usrfiles.com/ugd/73cb9e_a8ed783c42394312b441283b378b6dc4.pdf
    • https://static.usrfiles.com/ugd/38955b_43020a8896d649379725ac1f7ad8a579.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd8cb8e1c4cd4295b0317805ad0c1e85.pdf
    • https://static.usrfiles.com/ugd/2ac701_6e1139e60ba04c669508f351ef698e5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b1b6fdcb2ee450ab16f69ee811afecf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e37f0d60dca64d2186135b4c078352fe.pdf
    • https://static.usrfiles.com/ugd/963627_c21d580929b346d2bbf0f10a1c43e8c1.pdf
    • https://static.usrfiles.com/ugd/4c1554_814ced1b65294f728a95c18b95c741f7.pdf
    • https://static.usrfiles.com/ugd/2e16aa_444142ee708e4a7798d171fff6e44bc1.pdf
    • https://static.usrfiles.com/ugd/fb5067_29c5d4e118de4eb68e71bfaa54cd18b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafeba85272149c8a146bdad6c8026ef.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_off000046c3.bin
968a96bbe001f597c1c3d140c3423e99619caceb6be8a656ea8826f9afd1264b
pdf-font-stream PDF embedded font (sfnt) at offset 0x46C3 4588 bytes
font_01_sfnt_off0000564a.bin
9551cb62ee78613eee652990ff2736cd7c29ac66cbe7f983431871ffedf48b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x564A 10284 bytes
font_02_sfnt_off00007967.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 4324 bytes