Malicious PDF — malware analysis report

Static analysis result for SHA-256 22caa5dd39c58931…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 08:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4cbfacd1c749e34172bd56a7e3b8e6f SHA-1: 523180a1abf1e2331dd9d5c0de0daa793021803f SHA-256: 22caa5dd39c58931562d502fedbf0883bfd2ae88460d7f6e65b682e69ad2f149
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. The primary link, https://ttraff.ru/wix?keyword=paper+house+templates+to+print, is likely used to obscure the final malicious destination. The document body is heavily obfuscated, but the presence of many external links suggests a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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=paper+house+templates+to+print
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/91943677159.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/pevug.pdf
    • https://cdn.shopify.com/s/files/1/0440/6942/1206/files/amcas_applicant_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/tixirewojetewaliwesijezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/black_panther_movie_trailer_video.pdf
    • https://static.usrfiles.com/ugd/8b2c09_c7df809c25b148f1b41815448c59cb15.pdf
    • https://static.usrfiles.com/ugd/b8c837_113321a4240248e5a9ef02794b89c394.pdf
    • https://static.usrfiles.com/ugd/9219f8_178c2404998046ffba0af9730271bf37.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_5960af5df9074afba1393809dacf6dc2.pdf
    • https://static.usrfiles.com/ugd/b42fd6_9669c7ff571f4fc9970167eae47f2f4d.pdf
    • https://static.usrfiles.com/ugd/2274a7_fd57ec4bfa11462296df56b2d7e06824.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d04c07f51e4303a0146d706689667b.pdf
    • https://static.usrfiles.com/ugd/4d6844_58cd1f4f9ba84dd4b87fcd50db0e887e.pdf
    • https://static.usrfiles.com/ugd/696117_8325ae6899044e0c8c0041586ba3b50f.pdf
    • https://static.usrfiles.com/ugd/36f25b_05b4333d32dc4630ad04074692fb846c.pdf
    • https://static.usrfiles.com/ugd/b8c837_21746769b7df4ad4b972569c2d0c0613.pdf
    • https://static.usrfiles.com/ugd/3f4b99_f7216c7ec5524ec8a07c8b5fc6b08239.pdf
    • https://static.usrfiles.com/ugd/735189_36ebd5e126f34739b9ec79093edc1f30.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_off0000642d.bin
f07071addcd9ef14716d705cc7d03ddd186f0e60dbe959ac269b3eca1a1cf6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642D 5060 bytes
font_01_sfnt_off00007536.bin
e0cc462f39e3090f0f7f8d020c7cc4640e7fc27b6875c24cc9ab886e8f74813e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7536 10500 bytes

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