Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acb75ece9cfdb72…

MALICIOUS

PDF

37.4 KB Created: 2020-08-16 10:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04c32d3b0fdd3600d9cb4bbea7f8c2d8 SHA-1: f1e41b3a482be8a866026d97e5b7bef8922f6ddd SHA-256: 1acb75ece9cfdb7221c813b4a3d84c622ed1e0326d885c9c2f17a6b7cac76412
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=mathematical+modeling+4th+edition+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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=mathematical+modeling+4th+edition+pdf
    • http://files.winnebagopaddles.com/uploads/1/3/2/6/132682737/70fba276e.pdf
    • http://files.devonvintagecarclub.com/uploads/1/3/0/8/130814283/mujula-bibale-pevoxam-meloromoji.pdf
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdf
    • http://files.aslteen.com/uploads/1/3/1/6/131606755/favomuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/47467013048.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/30165618722.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/90462496913.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/rukoxizezoruwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/49792560103.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/strategic_capability_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/luvaxixakuk.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_off000054a9.bin
ddcc30e435bb067d822775afb113fde570361098184e65474ebb627eaa3e2b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A9 5388 bytes
font_01_sfnt_off000066ef.bin
880a6ef2aa877a00e21f75d703da517eb565bd09879739cbb240e3b59c66c367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 9948 bytes

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