Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef9b976aa7a5d26…

MALICIOUS

PDF

37.4 KB Created: 2020-07-27 14:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010e5cf280a193e58ab4333ca1ce970e SHA-1: dc39eda4078316710c9e5399f9150885425a542b SHA-256: eef9b976aa7a5d26ec4b458e95ccb690fa2eaf19d39d85308766f2d1db0d0fa9
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.ru', which is a known malicious infrastructure. Additionally, it hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the embedded malicious URL.

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=get+in+the+way+formal
    • http://files.whsmusic.net/uploads/1/3/0/7/130740213/8324048.pdf
    • http://files.hwmusic.org/uploads/1/3/1/3/131382092/nujokelajeromi_tovid_putososipobom_bugamewugavib.pdf
    • http://files.thesolidrockshop.com/uploads/1/3/0/8/130813797/zaxisufibuxuxigusi.pdf
    • http://files.delmarvagoldens.com/uploads/1/3/0/8/130874612/b839dcbe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/kewusenujigupisum.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/10030343515.pdf
    • https://cdn.shopify.com/s/files/1/0436/2780/6883/files/19415213796.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/60094294959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/53351165540.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4182/files/jupopomokedug.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/tokufikomegegugade.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6774/files/taguketonukexinor.pdf
    • https://cdn.shopify.com/s/files/1/0429/6835/0873/files/vomepuxojawiledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.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_off00005750.bin
ccdc85aca60b65c909df2169bdfc0afd8a874059bde16ec5ee3fe0a0f8fab510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5750 4844 bytes
font_01_sfnt_off000067ac.bin
344cf36565591af5d4d8815dad745fef11df0ea93d4358c10e2d6059b010841c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AC 9712 bytes

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