Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b41dbd5d13a871f…

MALICIOUS

PDF

38.7 KB Created: 2020-08-14 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e5fa4a691b00aafa51df962e70473c6 SHA-1: e93464e846165a679bd11c79768dbdc5ccfda3a2 SHA-256: 8b41dbd5d13a871f7269b27ccbebb06069e411d963899d8493929486d1d34fdf
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a large number of embedded links, many of which point to external resources. One of these links, https://ttraff.cc/wb?keyword=thrice%20greatest%20hermes%20mead%20pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to distribute the 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.cc/wb?keyword=thrice%20greatest%20hermes%20mead%20pdf
    • http://files.friendsofcountry.org/uploads/1/3/2/3/132303010/dimubojapefiri_netiwijan_rulitebi.pdf
    • http://files.melindatuhus.net/uploads/1/3/0/7/130775102/bumilubuzidedu.pdf
    • http://files.firetrailers.com/uploads/1/3/1/4/131453355/bazatipetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5603/7017/files/le_marxisme_rsum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/fexadijatet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5841/3216/files/alimentos_ricos_en_potasio_lista.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/jolelagetuvewuzafekajesiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/39482061975.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/fifegiso.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9912/files/sugijil.pdf
    • https://cdn.shopify.com/s/files/1/0434/4171/7414/files/47273206742.pdf
    • https://cdn.shopify.com/s/files/1/0427/4552/8487/files/problem_solving_model_in_social_work.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/descriptive_geometry_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2070/files/47940318398.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_off000058d6.bin
16d54e9029268dfe331b809500b7f5a31562c296c60871047f1c9868e9f5575d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D6 5488 bytes
font_01_sfnt_off00006b58.bin
b7e8ec8e49a68c6dc3ba7b5f67187f58f1c526fef791cbdd68e6e0f642cbbd97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 10136 bytes

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