Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff6bb046a9f6ad…

MALICIOUS

PDF

38.0 KB Created: 2020-08-07 17:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b4e03b75c2c1e48b55d6362df681837 SHA-1: 01239c8ccd155aee17f893c2f7f8cca0c1ab1cab SHA-256: 91ff6bb046a9f6ad2620fbe89600c3cc4dcea3683d142503662dc605511d0015
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. This suggests a social engineering attack aimed at directing users to malicious content through a deceptive PDF document. No scripts were extracted, and the document body was heavily obfuscated, but the heuristics strongly indicate a malicious redirector attempt.

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=arteriografia+coronaria+pdf
    • http://files.apexmedicalgas.com/uploads/1/3/0/7/130739463/rikixod.pdf
    • http://setizi.livestockmanagementsystems.co.uk/uploads/1/3/0/8/130814297/bewigexemal-sesotasilivig-xusidaxixeje.pdf
    • http://files.msimone.com/uploads/1/3/1/4/131453414/nidodi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/duvijunupogelirebegixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/wutelekatumulapugiwed.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/71721538247.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/65921832736.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/55317139823.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/59611356600.pdf
    • https://cdn.shopify.com/s/files/1/0434/8103/9013/files/18672966495.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/6474152764.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8135/files/mase_harlem_world.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/venumagezizomev.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/80609430450.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/rutisapixagorikujipaketob.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_off0000583f.bin
e86501bab929202fe147f88ee81e5770835d363dc8e5a78a26ff2157cb9b6271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583F 5100 bytes
font_01_sfnt_off000069b0.bin
70072927e0f30827b2087b7b1ee323869722747084cf8af418428c9d66737c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B0 10384 bytes

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