Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59cb197575ec3c5…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 14:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1048871e9e74cb87047ed3b0ecd70dd SHA-1: 4cad970f46149a3f5181af2dc8deef0736b7f867 SHA-256: a59cb197575ec3c5710995fc400c30a7c5f7994c751769ba50b4f83bfdfbbeae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to redirect the user to malicious infrastructure. The presence of a large number of external PDF links further supports the link farm heuristic.

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.com/wix?keyword=canadian+aboriginal+artists
    • https://static.usrfiles.com/ugd/accd1f_ed326cca9c444f8eaa6483f9b3ac79df.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a08c401915e4bd18991ef63afac1668.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_630c54849887437cb7a42ce6073867b7.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_224a8321579e40b2a303764319a7850f.pdf
    • https://static.usrfiles.com/ugd/bb13a2_a83cc9650c8c4dfcaf74777266e1d6b8.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/wupim.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/maria_sharapova_book.pdf
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/65469206920.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6759/files/kendo_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/68048495054.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_off00005f55.bin
820883289b8dfded7587183ab3f2e760ae23cfec1908b5915fa1dbd2a4e070d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F55 5040 bytes
font_01_sfnt_off00007076.bin
c3a2be851db585cd7195a0f3f193f124709f890d71b7ccd6fb58b53006f6dccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 10544 bytes

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