Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f718e2ba967b9fc…

MALICIOUS

PDF

33.8 KB Created: 2020-08-13 07:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 485adb702d317a783fe529e711084728 SHA-1: de25154a536617c5ec046fd3ece45b2adeffab77 SHA-256: 8f718e2ba967b9fce13912b054a59836e0a8d5ca656fe9eaccb98eb298c495bc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link farm heuristic, indicating a large number of outbound links. One of these links, 'https://ttraff.ru/pify?keyword=calculations+in+chemistry+dahm+2nd+edition+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting it's the primary lure. The file is a PDF generated by wkhtmltopdf, which is often used to create documents that mimic legitimate content to trick users into clicking malicious links.

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=calculations+in+chemistry+dahm+2nd+edition+pdf
    • http://files.amorrusticarts.com/uploads/1/3/0/9/130969623/218d3a.pdf
    • http://rekeniton.mickylynnexecutivetouch.com/uploads/1/3/1/3/131380429/fexebotidopo_manakepeb_bimizejuwoxu.pdf
    • http://files.jansceramic.com/uploads/1/3/0/8/130813827/c8d5c3.pdf
    • http://files.cavitesports.com/uploads/1/3/0/7/130775137/dotupopeve.pdf
    • http://duzuw.giftsrwanda.org/uploads/1/3/0/9/130969204/217c4f3.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/36974542638.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/john_deere_x475_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/74544819365.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/suraxofoxatamewefawifuso.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/back_bonding_concept.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/80769778001.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/subav.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/notebedatinekuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/jebode.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/69717988232.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/lafemumefis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0967/files/weather_mobile_al_hourly.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/9986784296.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_off00004624.bin
5f986b7004da4e4ee14d703a62c595ecf0857b56d4ba47c90d286f189065dabf
pdf-font-stream PDF embedded font (sfnt) at offset 0x4624 5532 bytes
font_01_sfnt_off000058cb.bin
d1aa93041240bfe66de7d30d5889995757edb1ea2434a2377fe69cff059f9eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x58CB 9736 bytes