Malicious PDF — malware analysis report

Static analysis result for SHA-256 290e8d1897031b07…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 07:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c576c4d6a4d7c542decaf3f77ad3e14a SHA-1: 98b8aee24619abc3fa9ade6835865be5b93b0abf SHA-256: 290e8d1897031b0702597c34ca0bb139e3338c35adc19e067d0814ed31ba2dc9
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=vir%25C3%25BCss%25C3%25BCz+film+indir'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://static.usrfiles.com/ugd/b8c837_33c5911492d4409795ef581bfa5e0f91.pdf'. The ML classifier also strongly flagged this PDF as malicious. The presence of these elements suggests the document's primary purpose is to lure users to malicious infrastructure.

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=vir%25C3%25BCss%25C3%25BCz+film+indir
    • https://static.usrfiles.com/ugd/b8c837_33c5911492d4409795ef581bfa5e0f91.pdf
    • https://static.usrfiles.com/ugd/e02969_fbe2486128bf49f8b4f85e0dab332c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_43c840659fd2480593c52aa8e440cea8.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a0d3bf25dd049388d06aee2dfef8673.pdf
    • https://static.usrfiles.com/ugd/a2d007_506a210d73c443d6be2d3c714bc89a2e.pdf
    • https://static.usrfiles.com/ugd/b7306e_b113a1a39d974ac3ae8e9d53cab37e35.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/robert_half_timesheet_login.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/muxapaso.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/sunesimuvij.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_off000058b3.bin
d763caa87a5420c70f57ac8e018d9adfabf17b13443fc787181fbb2fd1cbfddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B3 4980 bytes
font_01_sfnt_off0000695e.bin
95a6a93e2a6f3269c2360141ccc9d5d46513a125ffa7d3405baecf96e3354d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695E 11824 bytes

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