Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faea396766b4d96…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 07:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19450a7c52f544153e29543d9d08cc20 SHA-1: 21cbd84c884dc4a3aa619cb358abf1ca8afa3483 SHA-256: 8faea396766b4d96f57619d09b63d7c604262eaf933df01fadfa0f8d5f1f1e90
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.ru/wix?keyword=project+proposal+cover+letter+sample+doc', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of numerous external links suggests an attempt to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=project+proposal+cover+letter+sample+doc
    • https://static.usrfiles.com/ugd/b8c837_1aa57594e02e441ea95b5da593fdcb4f.pdf
    • https://static.usrfiles.com/ugd/6c98bc_63e4eec58cd74e38835654eaa2366d20.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_61cb35916a1541d3b16f2c488f97e48c.pdf
    • https://static.usrfiles.com/ugd/33ab24_5b55c64e077241d78184a3913066bf53.pdf
    • https://static.usrfiles.com/ugd/3aca14_f917959dec7b4582b7291b56dd37a975.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7938/files/nulabasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2423/files/pagovedupekujipakabugiton.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/48406711180.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/apple_app_store_scanner.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3189/files/71502895918.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/40722007248.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/66096422375.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/diya_aur_baati_hum_all_episodes.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9a077fd06d433392c193ee7a9845e5.pdf
    • https://static.usrfiles.com/ugd/9d869b_eb47d90ad7b8415493e5392c49a7601d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1cf448b6cbc46a68b31134152d4f845.pdf
    • https://static.usrfiles.com/ugd/b8c837_a182443aa60d49d9aceba2fbf9fcfffd.pdf
    • https://static.usrfiles.com/ugd/0511f5_0cb52c6ca8e1481f9f139f83ccc55cde.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_off00006481.bin
8807127e10ad53b95f4fbbed56864f998b2432534cb1774ce016cd2d2cde9861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 5356 bytes
font_01_sfnt_off000076a4.bin
a94c93a67a43610256d50825aca7ed0f9b60a6c1f10d803c0fa3c3e4c7bcf92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A4 9780 bytes

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