Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca25bb92e5683c99…

MALICIOUS

PDF

36.7 KB Created: 2020-08-29 12:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2518975159fcf1ad13b9de20cfa0dc96 SHA-1: d8c2c5c165f80492e7eabdadcafe5ae8e54ec973 SHA-256: ca25bb92e5683c99479fc0f1cb2e488d8d7760389b576a6e5eab925b673e95a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, with the first pointing to a Shopify domain. The document body, though heavily obfuscated, contains references to the redirector URL and several Shopify URLs, suggesting a lure to external content. No scripts were extracted from this sample.

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=roberts+radio+alarm+clock+instructions
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/guzirakowosukafubaxaruve.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/casino_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/download_aptitude_test_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/fekuvepumuxed.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/liter_to_gallons.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6992/files/58406397768.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/23857436858.pdf
    • https://cdn.shopify.com/s/files/1/0428/9773/5843/files/lymph_nodes_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/vopibemotomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/71674517965.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/zijiwuwuvixaxovuwujoke.pdf
    • https://static.usrfiles.com/ugd/b8c837_e364d45b16e04f329ad911d09b74ddfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.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_off00004bb3.bin
97fe1033235f2fbbdc52bdb59ac5b9391c9f584872228a56064324cc8e27cb58
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BB3 5296 bytes
font_01_sfnt_off00005d9a.bin
694340fc76d165a69a3ed3fc6c875d6563a06593d63987a603ee52c289921af8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9A 12080 bytes