Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fff5450cd8f5d4f…

MALICIOUS

PDF

44.2 KB Created: 2020-08-29 03:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 856b14876c7216fbadb8514ae4713bb8 SHA-1: 579bc5b9f3a6e4414e6eaffbf172ed4c6e227d34 SHA-256: 5fff5450cd8f5d4fc890f4f751b5a0738d40fc9c45076c59931e1aa3fd69205a
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but likely serve to obscure the malicious one. The ML classifier strongly supports the malicious verdict. While no scripts were extracted, the presence of embedded URLs and the redirector link indicate an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wix?keyword=trackmania+nations+forever+white+scr
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_369015d0020e4dee8665f1455887811e.pdf
    • https://static.usrfiles.com/ugd/b8c837_aecadd9cdb7045529b35631a50221f2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad78fa24dd2d46dcaa99271bdc585643.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec31714a27b74abebb7d7c62c86ad74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e583852ca8544ac5888c86b26d712f5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cad3769a64b436eaf0587d4bffad57c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31454b5c9f4623b96c73110c8518bf.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/35418843005.pdf
    • https://cdn.shopify.com/s/files/1/0435/5817/4883/files/according_to_matthew_movie_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/57743238731.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/bisonuzuminuvojuvidatep.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/dilut.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7303/files/layout_template_css.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2674/files/the_amazing_johnathan_death.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/29628817644.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_off00006cee.bin
d293d19058647cace2ceabb10452100ea379213d03f6492a06a919553f1a0de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 5256 bytes
font_01_sfnt_off00007eb4.bin
5f28198b56c9e83c1dd650039f6f6eace48d33a5d0d901362cb46f08867ba8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 11156 bytes

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