Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f4e6e40ae36b9b…

MALICIOUS

PDF

40.8 KB Created: 2020-08-18 21:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7750d929badc58dced0f4d3fd0a741f SHA-1: 8bb85d980d372bed6accace9d553341eb2f6b7ab SHA-256: a9f4e6e40ae36b9b4275ac488037e1f45fdfe14c3330313f3c519ae076588fb0
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to a game. The primary attack vector is likely the malicious redirector, which is designed to lead users to further malicious content.

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=game+toy+blast+unlimited
    • http://files.tennisjoopbroens.com/uploads/1/3/1/3/131398507/masabiwakowok.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/5140564045.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/betomikevomiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/behaviorisme_watson.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/defalagatuxeliwoxilajova.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/ruxetogegunefafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6319/7337/files/traumatisme_de_l_appareil_urinaire.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/centimetros_a_metros.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/mesotelioma_seram.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/72999560576.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_off00005746.bin
c07e0769a239544a04b3d3c0c20efefbde1ac4108fd0be6060c4c7f7a5538279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5746 5148 bytes
font_01_sfnt_off000068c2.bin
71409da356336b6f1ad4e7764bb6609919e3225212d28ca0b2f9c28e45ff4853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C2 14748 bytes

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