Malicious PDF — malware analysis report

Static analysis result for SHA-256 423187326cff88c5…

MALICIOUS

PDF

40.7 KB Created: 2020-08-24 07:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a204fb8c72e51e1d8362eb935b522e1a SHA-1: deb38fb632b01b2c31a8387d444071232b46f38b SHA-256: 423187326cff88c5c8a3d0bde5af508ba8e86e8927b7bf8f31b3331148bca167
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=microsoft+chess+titans++windows+7+professional'. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=microsoft+chess+titans++windows+7+professional
    • http://files.iamrockysworld.com/uploads/1/3/1/3/131397946/lebifisoronerumulu.pdf
    • https://cdn.shopify.com/s/files/1/0462/7903/2992/files/counter_strike_1._6_apkparadise.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/1265117458.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/dekufubewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/91830360437.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/vocabulaire_des_animaux_en_franais.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/zaboputela.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/95891271751.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/71650042393.pdf
    • https://cdn.shopify.com/s/files/1/0436/1319/2349/files/mibevakun.pdf
    • https://cdn.shopify.com/s/files/1/0439/9611/9198/files/caballo_de_troya_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/constant_deviation_spectrometer.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_off00005f7a.bin
f1e785d3b8c5765fdb8d39379bd60c1e697ebab5060ca0329039a727a56cd69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 5420 bytes
font_01_sfnt_off000071fd.bin
4ca4e8b2849eb92c51556a84197880585b3bb9493851067ed5d21bf109497dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FD 10488 bytes

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