Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cdc7d9abb357e6…

MALICIOUS

PDF

44.2 KB Created: 2020-08-20 23:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b15a2b8ccd920a7c38c00df0f67ab393 SHA-1: 141318cbc3ad3717fb7faf44a4073fdee57a8ebc SHA-256: 86cdc7d9abb357e60699a405f0977aeb85004e2b40a336a22fd3fff25058a013
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 'https://ttraff.cc/pify?keyword=aliexpress+apk+old+version'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0430/3680/3233/files/afd_sachsen_wahlprogramm.pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the redirector URL, suggesting it's part of the lure.

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.cc/pify?keyword=aliexpress+apk+old+version
    • http://files.rhicoh.org/uploads/1/3/0/7/130738799/bb1f72.pdf
    • http://rezizekob.mycarnabyscooter.com/uploads/1/3/0/8/130874493/wujasofawag.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/afd_sachsen_wahlprogramm.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/10134336700.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/kelizumogiburol.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/ohio_state_football_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/datogulivifisina.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/60527964335.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/88237786544.pdf
    • https://cdn.shopify.com/s/files/1/0437/9806/9410/files/bejeweled_blitz_pc_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/povusedizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.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_off00007165.bin
a24bf138978d3391236b0af2baafa85aca3c94ddde0e545e219f61f81d70ad00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7165 5132 bytes
font_01_sfnt_off000082ee.bin
e86c415ca35e4ebcd902d6a81533d1e1a0e067415dcc60feb14e633cae24811f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EE 9628 bytes

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