Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a5b5fba2f78281…

MALICIOUS

PDF

42.6 KB Created: 2020-08-20 05:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b662262253065b827c35c62a557846 SHA-1: 22245ec9f2bd89de40671e3e711ce6d3cc51a619 SHA-256: 93a5b5fba2f7828168dfe1a858125bb4f87af8b233ed39442a01f67dbefe8073
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.ru/pify?keyword=types+of+sentences+worksheet+3rd+grade`. This URL is presented within the document body, disguised as a worksheet title. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on `cdn.shopify.com`. The ML classifier strongly indicates maliciousness.

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=types+of+sentences+worksheet+3rd+grade
    • http://files.stevenmmillerphotography.com/uploads/1/3/1/8/131856257/2400257.pdf
    • http://files.giuliapezzali.com/uploads/1/3/0/8/130814605/kipusakosagidole.pdf
    • http://vefomotek.themoviepress.com/uploads/1/3/1/6/131607310/wudepolufuxufu.pdf
    • http://files.drpetermessmore.com/uploads/1/3/1/4/131454696/442640036.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/16213952135.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/83612890845.pdf
    • https://cdn.shopify.com/s/files/1/0436/5120/3225/files/agronomy_and_its_scope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/5702924979.pdf
    • https://cdn.shopify.com/s/files/1/0435/2802/8312/files/kodilasiketozugoboti.pdf
    • https://cdn.shopify.com/s/files/1/0434/6521/2066/files/lupudeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/19637064730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0440/5955/8053/files/37934007031.pdf
    • https://cdn.shopify.com/s/files/1/0447/1400/0538/files/numbers_1-_30_in_spanish_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e6.bin
92803dec01f3832b3adaead480eb0b051b2b9de3eccfe9b399f9bbd19ddd1eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E6 5496 bytes
font_01_sfnt_off00006ca6.bin
baf66ff67fdbe8f48687567d916aa58a833e2a95e96fa4909f03a1c88166e81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA6 10388 bytes
font_02_sfnt_off00008f8d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8D 4324 bytes

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