Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2b2775f1f6e335…

MALICIOUS

PDF

46.1 KB Created: 2020-08-02 18:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13b5cffc12bf03228d2c2008d93c3b3 SHA-1: 8bf19623a443e8fd563cde80a2127cbe7e17e05d SHA-256: fa2b2775f1f6e335c19e371eab9ee5cea6c6dd3d2543984bfc2c8576eac3de51
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=driven+k+bromberg+pdf'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to artificially inflate search engine rankings or distribute multiple malicious links. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same 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=driven+k+bromberg+pdf
    • http://files.sarusfestival.org/uploads/1/3/1/4/131453894/3958547.pdf
    • http://files.androidtvperth.com/uploads/1/3/1/4/131438397/vepow-fuwoside-fusevaxedewagi.pdf
    • http://files.eireannsartsandcrafts.shop/uploads/1/3/0/7/130776492/63b58cf54bea.pdf
    • http://files.gthydrographics.com/uploads/1/3/2/7/132712080/3b670ba76fb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9484/files/28800767734.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/rowujomadesofi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/75731817680.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/16078320560.pdf
    • https://cdn.shopify.com/s/files/1/0432/1397/9812/files/tibomuxopusoradobikixobex.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/98161460632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bivunamu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/magna_carta_tears_of_blood.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/rumonotomadozivo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/sositerazexijapuvur.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/85875867309.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_off000077a5.bin
a5ab00cab06bea34c4ea763cd4690a0b46354774da45971b805c806b2116b12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A5 5204 bytes
font_01_sfnt_off0000894f.bin
fa93fff58e374558363eced8be40cc30148cc7451e993ab6c6f70dc10ded8047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894F 9996 bytes

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