Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c8fadff97c2783…

MALICIOUS

PDF

37.7 KB Created: 2020-11-05 07:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b4a4fd23923bffd2b01904fc593acb6 SHA-1: 7de144825a0b4ecf740b80f767f27b6d582ba161 SHA-256: b4c8fadff97c2783145ce641251639a344aa2f6bdd48e97793f4b71fad673c9d
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, disguised with a seemingly innocuous search query. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of a malicious link suggests an attempt to redirect the user to a site that likely hosts a further exploit or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=my+hero+academia+ep+24+english+dub+funimation
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5f8ca0602db42.pdf
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f8ff2973d5cc.pdf
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f90cd9aadbfd.pdf
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5f9ecf3143099.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5f948b41a4a90.pdf
    • https://cdn-cms.f-static.net/uploads/4415525/normal_5f9cd0eedab50.pdf
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5f9b178809300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3718dc2-5dca-4d91-b8c5-771e3680edae/5th_grade_coordinate_plane_worksheet.pdf
    • https://s3.amazonaws.com/farezelof/lifeguide_bible_study_genesis.pdf
    • https://s3.amazonaws.com/zirojopemup/hillsborough_county_marriage_license.pdf
    • https://uploads.strikinglycdn.com/files/aa6bde8c-2a4b-4939-a4a5-70c44b4ee93c/fiforofa.pdf
    • https://uploads.strikinglycdn.com/files/b05c9730-0dd6-408f-a362-7b02d92ec9d7/ayda_mosharraf_isyan_indir.pdf
    • https://uploads.strikinglycdn.com/files/1f07bc5c-dce9-49ea-a83f-bf941398128e/nutarubex.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_off0000533e.bin
6e85cd4daa8f13e94d2ce18f8f7d45126810e7631a7877136b718156528691bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x533E 6036 bytes
font_01_sfnt_off000067b8.bin
975701de971b850815ae528d2145eb33f343a0a9c2a4b3ee73804381adea8cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 9968 bytes

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