Malicious PDF — malware analysis report

Static analysis result for SHA-256 8031bd001f149cd0…

MALICIOUS

PDF

48.0 KB Created: 2020-09-05 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e1dadefd07165f0d87981bdb546780a SHA-1: 50e3f76e22117e2f91b7f842af45363f4ea8c881 SHA-256: 8031bd001f149cd0562036d5ee1e869c362527860ed98409ff3326786f540ad4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=visual+code+format+javascript, which is likely intended to lead the user to malicious content. The presence of numerous PDF links suggests an attempt to obscure the true malicious destination or engage in SEO manipulation for malicious purposes.

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.me/wix?keyword=visual+code+format+javascript
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0cb7a68ba40f40898af76c2d6bd1c429.pdf
    • https://static.usrfiles.com/ugd/ca300b_2f9c95cc48aa4554929fc8a514438ea8.pdf
    • https://static.usrfiles.com/ugd/ecec20_fe09715017d84b1c907cc10ac04f9d12.pdf
    • https://static.usrfiles.com/ugd/136d07_f355a2f479374f71990e8c886adb15a3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/limetojaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/total_force_vlc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/37463353940.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/guess_who_s_baby_picture_game_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/83074542531.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/28065064952.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/97274921411.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/knee_injury_and_osteoarthritis_outcome_score.pdf
    • https://static.usrfiles.com/ugd/a58b01_61f2ec7281b9432a8bbe476839ce9eaa.pdf
    • https://static.usrfiles.com/ugd/ecd213_f3816362a37e42bdb88328cc37c72533.pdf
    • https://static.usrfiles.com/ugd/d4da64_18193917711a441d9054474d4293e464.pdf
    • https://static.usrfiles.com/ugd/cf14a4_44acffacce624be58fa78b934370d7d6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b16.bin
75daba3e6e1004acd3c3223f0f00669e09b44c0ab038064c52e05fe4aca2a223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B16 5400 bytes
font_01_sfnt_off00008d70.bin
726c841faf626fc3ebe691cf2f8ad101c939aa5c6015a8f24cda9c3ad701f37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D70 11116 bytes

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