Malicious PDF — malware analysis report

Static analysis result for SHA-256 a723c275c78be6cd…

MALICIOUS

PDF

41.6 KB Created: 2020-08-17 12:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afecc1eba9ca4f423f849311f0603b0c SHA-1: 2e530283864186eb989e4a6959b13e0bb2c7c4a9 SHA-256: a723c275c78be6cdca578a41969fd5a2c433ca639dff3dcf7a9759acace6b1d0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=giant+excavator+rust+guide'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a link to a PDF hosted on Shopify. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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=giant+excavator+rust+guide
    • http://files.indianaaeop.com/uploads/1/3/1/4/131438539/0eea295ae.pdf
    • https://cdn.shopify.com/s/files/1/0440/5270/9526/files/assembler_des_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/27162476083.pdf
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/ashok_leyland_dost_specification.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/an_introduction_to_political_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/minutuninisa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/90018208684.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/boulevard_of_broken_dreams_drum_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/subaru_ej25_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/sawupujodumuvowukolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/870712304.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_off000061bf.bin
a842da2b61835d707231d9011d0e9f29a05e6f7f476ecf6dba6e343a854e8eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 5236 bytes
font_01_sfnt_off0000739e.bin
f5753e2efbb63cb84c52dd248d7e1c5674a7b47ad1b7dad08c807d0047fea045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 11668 bytes

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