Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5daa17bbbc2ec64…

MALICIOUS

PDF

40.8 KB Created: 2020-08-18 18:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a65f05b02e058ffc04781da666b3fcb0 SHA-1: 8fdf95c32b503c2a03dadec990f32a0fde408aff SHA-256: f5daa17bbbc2ec6479d2b1da26fbb4a71eba27ea774720fe459454e28bc51816
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 ttraff.com. The document body, though heavily obfuscated, contains text related to 'Asus driver windows 8.1 64 bit' and the malicious URL, suggesting a lure for users seeking specific drivers. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. 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.com/pify?keyword=asus+driver++windows+8.+1+64+bit
    • http://jegarakob.dsmtoolworks.com/uploads/1/3/1/4/131453674/fugevujajabi-navogopa-jevosebutof.pdf
    • http://files.jessiebeefit.com.au/uploads/1/3/2/6/132695257/wilipojodemoxi-guriboxelekiroz-kiserevo.pdf
    • http://files.charliescrusaders.org/uploads/1/3/1/3/131379706/bubufivoruf-xosizawe-kujame.pdf
    • http://files.ambergirl.org/uploads/1/3/1/4/131409309/werenixobubepelalepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vojinanekarab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0047/files/vector_blf_file_format_specification.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/sokog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3764/files/java_graphics_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/simple_green_smoothie_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/mejewipoxuwanexive.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/lks_aritmatika_sosial.pdf
    • https://cdn.shopify.com/s/files/1/0438/1150/4288/files/tatafa.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_off000061f5.bin
270905d5fcf8dc1977a0fbb636beffc1a650bc46dce4c9f532b58135e6706695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F5 5376 bytes
font_01_sfnt_off0000746f.bin
1eacab5599441a02c506ea7be42b4f4b0f1ba51d04cb08086179c9ea2f57f432		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746F 9948 bytes

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