Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca62b8456c271ac…

MALICIOUS

PDF

73.6 KB Created: 2020-08-04 23:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45bb9462296809ad9af4f5c14570424 SHA-1: cb84f180a891457d93fdef70ca0a0237887a6f55 SHA-256: aca62b8456c271ac6f118259f7d0b603f0fd9c9069fcd022408be2da60e1c63f
150 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. Additionally, it features a PDF link farm, indicating a tactic to generate traffic or distribute content through numerous external links. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, which is also the primary malicious redirector, is reconstructed as 'https://ttraff.com/pify?keyword=computer+arithmetic+algorithms+and+hardware+implementations+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=computer+arithmetic+algorithms+and+hardware+implementations+pdf
    • http://files.kjaassociates.com/uploads/1/3/1/3/131380651/pofajuwisafanos_jalisakonifaj.pdf
    • http://files.harrisburgvictimhelp.org/uploads/1/3/0/8/130813416/9668581.pdf
    • http://files.kreis6english.ch/uploads/1/3/1/3/131383825/limogowop-mavikejebu-bisapop.pdf
    • http://files.followingthejoy.com/uploads/1/3/0/9/130969424/panavufabemena_kabeburo_vaxuki_mizuvaxoxon.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/14589239023.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/modern_control_systems_13th.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/rules_of_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/wizer.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/58247892811.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/remobozevuwepufasezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/princess_diana_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3111/files/54033820757.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/25441125683.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/25483152634.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_off0000d63e.bin
9d6ea2b20afbc0d0e9920de0926ee97894dc1769aaab85c8e7ae92b17e28a838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 5564 bytes
font_01_sfnt_off0000e909.bin
17ebbf52016b8be8c522c410e002a99d719da8f5ed039225189f75cef44fa9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 15496 bytes

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