Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c462322c66317c…

MALICIOUS

PDF

35.8 KB Created: 2020-08-15 20:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f6042f773738c82191c49cb8158e539 SHA-1: 1d5c72f9a58c6cb57f5546abcae708ca92277126 SHA-256: f7c462322c66317c4f924f79440f9c3421a2e16094d841b551971c92a9822d9b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell 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 an 'employer requesting reference letter template', suggesting a social engineering lure. The PDF also contains a link farm of 28 external PDF links, many hosted on Shopify, which is a common tactic for SEO poisoning or distributing malicious content. The primary malicious IOC is the redirector URL.

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=employer+requesting+reference+letter+template
    • http://files.mbcnavarino.org/uploads/1/3/1/3/131383821/xowenozuwusu-mulififugi-modofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/powerpoint_games_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/menozuwiwinej.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/tizorojarajibutevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/38421466893.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/91822770894.pdf
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/tom_hiddleston_imdb.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/vewisap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/angularjs_8_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/4161/8082/files/jawizaderexivisefado.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/golang_code_review.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7910/files/punaxatutasolizute.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/vafidotogiteposogoriluv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/towitelixutulut.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_off00004d5f.bin
dcc50e32b22f26f39d4d1fac9450c26f3d9561a3a57705add75359a2571ff72b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5F 5520 bytes
font_01_sfnt_off0000601d.bin
1dd2718248e0a9c551e02797741eb89e8710281f0432b200366083c031262e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 10024 bytes

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