Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6296f2761ad981…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 06:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee7f3409daa0379f3669d816c817559c SHA-1: 6132bda9e5a70a921319893379b2e56834378334 SHA-256: 0f6296f2761ad9810db49bfcdfffec48cdf769d3121b1a13a63b156ac72ce7c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL, https://ttraff.cc/wix?keyword=tadelis+game+theory+solutions, is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and other links to what appear to be benign PDFs, likely intended to mask the malicious intent. The ML classifier strongly indicates 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.cc/wix?keyword=tadelis+game+theory+solutions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f1780b_4a26f5a40b9b47d39f0019d6657f2b42.pdf
    • https://static.usrfiles.com/ugd/b8c837_c61f6b77d62540bba99e722449cd760c.pdf
    • https://static.usrfiles.com/ugd/2ca09c_64b5a4cb019a46f19f9c5d0c7e8fbfd7.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/58236640951.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/wutusigijagazukabasitaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/anbe_sivam_songs_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0431/0699/2289/files/kezexuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/hobbs_and_shaw_poster.pdf
    • https://static.usrfiles.com/ugd/1f2646_9cf01d739e5445d3a66b43d18d7ab3a4.pdf
    • https://static.usrfiles.com/ugd/b972d5_4e48f0027bc641a88bc6583c4cb6c41f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e970a08bb34040f18b03cb4b73bfd364.pdf
    • https://static.usrfiles.com/ugd/455f95_a896c988a09f4cad9dda6d699df93b36.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_off00005519.bin
3ff37a2a44f916cd5a3411b1f9b5f97d40a338883f3c7762e0125645be4b4736
pdf-font-stream PDF embedded font (sfnt) at offset 0x5519 5288 bytes
font_01_sfnt_off000066f7.bin
257b05aab2b07be11a6ff5acca89c4fe71f1c06da6c462876df6ea1f60cfb7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F7 9868 bytes