Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e36aacc4b95c6e…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 04:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc4bbc77210e9b1007a97f9058b613a SHA-1: eaaff903d86d634001a1e230d1ac1e1c4a0325a7 SHA-256: f6e36aacc4b95c6e48c0c4a0ba0ff8066bfc748034270b9137da9c9dc27a4db6
150 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 'https://ttraff.ru/pify?keyword=hp+laptop+brightness+driver++windows+10'. This URL is part of a link farm designed to manipulate search engine results, aiming to trick users into downloading files. The document body, though heavily obfuscated, contains similar URLs, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=hp+laptop+brightness+driver++windows+10
    • http://files.barkway-village.org.uk/uploads/1/3/2/7/132740260/b54b5da92a.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/gulelagomumavatevak.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/simple_present_past_and_future_tense_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/42567150533.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/functional_groups_table_in_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/kifabuwipam.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/88405053030.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/nozixisixuzin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3432/8738/files/togona.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/tutodadugidodedevigar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/83933128409.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/automation_anywhere_10._5_user_manual.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_off00006350.bin
13741af055592aada149d51a114a07b510b7162676101da3d9621bffbe5349ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6350 5668 bytes
font_01_sfnt_off00007699.bin
b4e3c622c4d903771d3cafcee4318bdfacb392cd7ebf923ada454c4de0efb7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7699 10440 bytes

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