Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb38824f1d53337…

MALICIOUS

PDF

35.8 KB Created: 2020-08-12 04:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c941c756da1a3268d3df68d7e094e1d SHA-1: 1bc1568a835f89bba807fb6982cc181e5778584a SHA-256: fbb38824f1d53337ac8c6764f60114c27e06c042ba0731e133742c78cf0323b1
152 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 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a lure to external content, likely for phishing or malware delivery.

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/pify?keyword=candid%25C3%25ADase+mucocut%25C3%25A2nea+cr%25C3%25B4nica+pdf
    • http://zanuwif.blackcatmovement.com/uploads/1/3/2/6/132681218/68868dd229f864e.pdf
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
    • http://files.regulatorycounsel.net/uploads/1/3/1/8/131871556/2989748.pdf
    • http://nutule.trevanitruffles.net/uploads/1/3/2/7/132740405/lilovodosenok.pdf
    • http://nekajod.dandanthemattressman.com/uploads/1/3/2/3/132303027/1723762.pdf
    • https://cdn.shopify.com/s/files/1/0438/1969/6290/files/94667042373.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/68839727727.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/99990102420.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/88243665755.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/11842867865.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/77991042733.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/posiripirigagupasipepele.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/98528871424.pdf
    • https://cdn.shopify.com/s/files/1/0430/0826/2297/files/free_software_to_convert_file_to_word_doc.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/13136768606.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/borderlands_3_echocast_twitch_extension.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/logobanepimegejikixetaki.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_off00004bc1.bin
160b5f199e9f73b540a87c37073bfc7390f580931ea98957c218a3107af16fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC1 5612 bytes
font_01_sfnt_off00005de9.bin
745b0a6c3326d2d230124b0211ee4f3213943e2748a03f205f0c2c4caae3f977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 11280 bytes

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