Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbf9a7fa37a3a12…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 06:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7ca5854360f84a6093a5a563a2fe1f4 SHA-1: 6fa85aad1ccac7813c391beab87415a99d698de2 SHA-256: 7dbf9a7fa37a3a1269b12a23d68aa0e643e6ab41d39c407c066521a5acd3b573
154 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 'https://ttraff.cc/wix?keyword=simon+vs+the+homosapien+agenda+chara'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which are to benign PDF files. The ML classifier strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, appears to contain the malicious URL and a list of other URLs, suggesting an attempt to lure the user to malicious infrastructure.

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=simon+vs+the+homosapien+agenda+chara
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/36f25b_eca49541c6a745aaac39ea1e17e3d6fa.pdf
    • https://static.usrfiles.com/ugd/dd4472_2e65a27de3714a5ca598242657218e12.pdf
    • https://static.usrfiles.com/ugd/4dd980_3ff3533555584c1cbf9604b8b9762dc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8801f67e37f84cefb3a1839db9e3e676.pdf
    • https://static.usrfiles.com/ugd/b8c837_04cff1fba101469d8086848e1e7b3807.pdf
    • https://static.usrfiles.com/ugd/63d3ad_510f72eb296640fe978a4c20e8f09c5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_47e5c5547b27434584b39b494b5f558c.pdf
    • https://static.usrfiles.com/ugd/c8a981_4a21cc074a934a4ca5ce42dcd96d7c58.pdf
    • https://static.usrfiles.com/ugd/b8c837_a41ee739c4c04b99ab9cfd73163e7638.pdf
    • https://static.usrfiles.com/ugd/73cb9e_ef830b18bd594297b4f6d9859658cd52.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcd8973795be41eb839cd04e31656ea2.pdf
    • https://static.usrfiles.com/ugd/6240f8_c127a188848f42378ae951f1ae5362b2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007431.bin
3614813529bec47e0618f135115570e234e868abaa331fa71521f1e274d5b018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 5408 bytes
font_01_sfnt_off0000865d.bin
53d82187c339dba57a83211be08d1ac215c57564e3de89e5d7b6aa35ff9e5942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 10188 bytes
font_02_sfnt_off0000a943.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA943 4324 bytes

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