Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6398c2fb6ced7d1…

MALICIOUS

PDF

41.4 KB Created: 2020-08-14 22:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b97cf268cedd679781d152d73b417c6 SHA-1: 43b5c76f16f0c8cecfa8f8d77904db6d664f1fd3 SHA-256: a6398c2fb6ced7d1439370db3187e08f60d1da01f3162421664d78b515345ad9
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the string 'Chegg ebooks to pdf', suggesting a lure. The PDF also contains a large number of external links, many hosted on 'cdn.shopify.com', which is flagged as a PDF link farm. 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=chegg+ebooks+to+pdf
    • http://files.djspeaking.com/uploads/1/3/0/9/130969056/1389164.pdf
    • http://gufodis.michelefioretti.com/uploads/1/3/0/8/130874043/d103f9cf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/19541014149.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/29091139881.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/76873689212.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/38465936595.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/business_communication_notes_mba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/dutifusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9745/files/fuvufedavitadul.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/88604793173.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/63918394886.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_off00006357.bin
f91aa3e0607d14c00c317c27366646b3f076829a423c890e25461417c1730918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6357 5072 bytes
font_01_sfnt_off00007498.bin
a34a81dbbd160932793b99d893d3651871c998b51da9ce78c56049d4216e2cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7498 10616 bytes

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