Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac337b2aaa26966…

MALICIOUS

PDF

39.9 KB Created: 2020-08-03 19:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac71a2527008187d56f51efac7f61277 SHA-1: afc9aa27bb9c737c75f4cf55adb46574c4373ec1 SHA-256: aac337b2aaa26966084f3b48374c568755f2ea4a838c701bf4538b6f84a6f9d6
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, specifically 'https://ttraff.ru/pify?keyword=lead+acid+battery+msds+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=lead+acid+battery+msds+pdf
    • http://files.delsurvey.com/uploads/1/3/1/4/131408056/tesodepibitajukixif.pdf
    • http://files.pachecoathletics.com/uploads/1/3/1/6/131636941/tikazadesomo.pdf
    • http://files.nevadadiscoveryride.com/uploads/1/3/0/7/130776015/livuwifamijeregedapi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/72074876441.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/87107454336.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/36612121855.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/one_grung_above.pdf
    • https://cdn.shopify.com/s/files/1/0438/4191/2997/files/zavusomujenelegot.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/94689502146.pdf
    • https://cdn.shopify.com/s/files/1/0437/7696/6808/files/tafalumoloz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4490/files/16411867642.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1562/files/wow_enchanting_leveling_guide.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_off00005e47.bin
9e3efc00b79a4887c122f77bd1f3c4922bdf04c6e7fb06dbe37c619f41897258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47 5452 bytes
font_01_sfnt_off000070bd.bin
1149065056771c72cb625a7dbdba226067e3692da809e8a7645933690bb6b56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BD 10076 bytes

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