Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18c67e173b11166…

MALICIOUS

PDF

107.3 KB Created: 2020-08-03 22:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5dbb27a4482f55c1398de93800b36ea SHA-1: 1f3c5da15cc6cc9bfa7fdd21e6df08b9ef071630 SHA-256: a18c67e173b111663c0968fb9276264da29f2b96d478ab9140cbd9c89fc8ef77
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=structure+elucidation+of+cholesterol+pdf. The document body, though heavily obfuscated, contains this URL, suggesting the document's purpose is to redirect users to malicious content. The ML classifier also flagged this PDF with high confidence.

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.ru/pify?keyword=structure+elucidation+of+cholesterol+pdf
    • http://files.mplsalpineski.org/uploads/1/3/0/7/130775341/lekafinigijuwupob.pdf
    • http://files.readingleaves.net/uploads/1/3/1/8/131857270/gowanakawege.pdf
    • http://files.homehomeschool.com/uploads/1/3/0/9/130969847/520536.pdf
    • http://files.gpuuc.org/uploads/1/3/0/7/130776141/pidoxi_zinaven_pesavotuxifaxel_bebomavid.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6887/files/9432538003.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/sobir.pdf
    • https://cdn.shopify.com/s/files/1/0441/1051/2280/files/die_casting_machine_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/31444158197.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72905654063.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/74140901407.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/59445054753.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/delete_my_activity.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/rawofutupigufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/guxifezawoxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/mizupifojajunazemixurewal.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/xotajizumoguragexukisoli.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_off000156f5.bin
751a2dd1429ea56d65a57cf35dbe5a94d7000e005fb90ebf3156bcdfb30ff71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156F5 5344 bytes
font_01_sfnt_off0001691c.bin
a3ee764bd0d1ac6969ca4ba37d899ead2f87cb4a4a384230ac0ad761e11b1488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1691C 17644 bytes

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