Malicious PDF — malware analysis report

Static analysis result for SHA-256 3131bfbac240e37e…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 03:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a71a08cff3808e07fbd88b37896e5a0 SHA-1: d3b4e926f13bf52356438262e3b6fe8b19fcf5af SHA-256: 3131bfbac240e37e414a2d090a6b5327f2aceea4ca8d2c3cac571a287e64ac0d
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.ru/wix?keyword=shadow+of+war+dlc+tribes'. This indicates the document's primary purpose is to redirect users to potentially harmful content, likely a phishing or malware distribution site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, but the malicious link is sufficient evidence for the attack pattern.

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=shadow+of+war+dlc+tribes
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/20543280399.pdf
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/porgy_dubose_heyward.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/google_account_couldn_t_sign_in_android.pdf
    • https://static.usrfiles.com/ugd/b8c837_667dfbe41eec4e3195ef6593cafb208b.pdf
    • https://static.usrfiles.com/ugd/b8c837_beba4432736d44e8bebca1d18845bce3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/95101437851.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/39837693850.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/payment_system_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/subizemagowexapupamuxup.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/dezukufozofejixuju.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_588c098356cb40539b68ae3a4f8cf933.pdf
    • https://static.usrfiles.com/ugd/e2b09b_085bc0728e134017932c0a9650fefebb.pdf
    • https://static.usrfiles.com/ugd/0bcf16_a2bfa915abb244bda36ce6bd0b68efcf.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_off0000668a.bin
8d276d90f4c0d2f5985d0595948f3bbd83759636288b1fe0c2a13172480f5ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 5124 bytes
font_01_sfnt_off0000780e.bin
bb4991c52dfe4835637c28ab65990b84e666d136a72052f0216210e6707e3419
pdf-font-stream PDF embedded font (sfnt) at offset 0x780E 10164 bytes
font_02_sfnt_off00009aaf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAF 4324 bytes