Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb23ccb923adcaa0…

MALICIOUS

PDF

51.2 KB Created: 2020-09-04 02:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a737e7e3f089f0f40a936b89688643 SHA-1: ba03255d24c67fdf27378085d90cdbf19f2a4ad2 SHA-256: eb23ccb923adcaa0bb994d3804c77263afbe8b0cdbdac9b1c6e32d8968b02d27
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=party+invitation+template+free+online'. This link is presented within the document body, suggesting a social engineering lure to entice users to click. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm further indicates malicious intent.

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=party+invitation+template+free+online
    • https://static.usrfiles.com/ugd/de65f7_22e803124a4a48399056583639611622.pdf
    • https://static.usrfiles.com/ugd/c33f71_1ad1fc2485334a3d8bb10c0297ac8e4c.pdf
    • https://static.usrfiles.com/ugd/704566_707d8eaff87c47ea930fe9f449b2bee5.pdf
    • https://static.usrfiles.com/ugd/5a4aad_02ce7da97af24bfd80078b31ba57ca08.pdf
    • https://static.usrfiles.com/ugd/cc1a03_1ba7149009534e9e90e80418d74c417d.pdf
    • https://cdn.shopify.com/s/files/1/0469/0457/4114/files/vudizugimenav.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/17255482607.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_3541425e35ed46a58afaddb8cbc437ff.pdf
    • https://static.usrfiles.com/ugd/f4de5e_9eefdee268bc44b6bdbe171d9e566dd5.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_off0000846f.bin
c3bf07d576b181ccca0ff0aceb4aef632f1aa527e4d03f2035fb75c80c2e5bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846F 5032 bytes
font_01_sfnt_off0000958a.bin
984cac366063569c9638852d74f13628d2588f7b1496333e17f048985cf752c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958A 13244 bytes

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