Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90ae1f62b35c92…

MALICIOUS

PDF

41.2 KB Created: 2020-08-01 23:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a23b90744814b58fa369b32bfe2f243a SHA-1: 99c5b858aa720497fc2503f1b4cd45f6397429f8 SHA-256: dc90ae1f62b35c92a3c6985b6f89e7f8bf2fffcf8a3591007539e2fc3bf131b4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a deceptive message about Discord audio issues, aiming to trick the user into clicking a link. This link, 'https://ttraff.com/pify?keyword=can%2527+t+hear+anyone+on+discord', leads to a known malicious redirector. The document also hosts a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm for SEO poisoning or traffic redirection. The ML classifier strongly supports the malicious nature of this PDF.

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=can%2527+t+hear+anyone+on+discord
    • http://files.stocktontrapandskeet.com/uploads/1/3/1/8/131856672/6dc0c891d667.pdf
    • http://files.blockchaininvestments.nl/uploads/1/3/1/0/131071240/3729714.pdf
    • http://files.whichwolfwillwin.com/uploads/1/3/0/8/130813888/9678438.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/58763107369.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/36482062712.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/72549057140.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/69884684016.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/21559224197.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/98864956251.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/97330722490.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/74525949088.pdf
    • https://cdn.shopify.com/s/files/1/0435/7393/6291/files/fefutawesogidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/77077700695.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/69980278860.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_off0000648b.bin
8af15bbca8193acd2d12436e507a472e83981a9a1f713139e5ecf945b6923a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648B 5036 bytes
font_01_sfnt_off000075af.bin
b6b2f11175164e66c07b75bbf80fee211436a6341aec518ae80c3ff84eaa6f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 9932 bytes

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