Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afc7f5bba9876dd…

MALICIOUS

PDF

37.2 KB Created: 2020-11-03 14:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9440ee077491ad78c68c9ad32e558b7a SHA-1: 7fc63d32f3a87e98475bc2575685e98a8c9fac7d SHA-256: 8afc7f5bba9876dda0ac9414d38bf4d6f81c2e0b3370b2fd1b512f3b4786880e
94 Risk Score

Malware Insights

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

The PDF contains an embedded link to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

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.ru/123?keyword=tale+of+despereaux+book+worksheets
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5f9709dddb0a1.pdf
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/823f4b6937.pdf
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/wibewuwebenajef.pdf
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5f95081eb0b4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6f09a5c-fe0a-4681-8eb0-13404a70ee6f/83631705866.pdf
    • https://uploads.strikinglycdn.com/files/01785cfb-198a-4f06-9e1a-3b2119f15122/bekefak.pdf
    • https://uploads.strikinglycdn.com/files/71145cf8-e1f4-417b-8d28-8acc8bf3ef91/4457019313.pdf
    • https://s3.amazonaws.com/jewizopukuni/super_mario_64_multiplayer.z64.pdf
    • https://s3.amazonaws.com/vazisi/dragon_ball_super_episode_124_english_sub_funimation.pdf
    • https://uploads.strikinglycdn.com/files/43da36dc-0bef-4c3b-9e25-f8cbc3f3feff/white_cloud_flea_market.pdf
    • https://s3.amazonaws.com/doxifuba/ruginufaxawuke.pdf
    • https://s3.amazonaws.com/teximikamukubo/azure_devops_manual.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_off000051c5.bin
4df47fdc6c33144ff5fc5e73e4d87db82baa192a4f160b5eb9ccba5ca19985c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C5 5444 bytes
font_01_sfnt_off00006456.bin
0e50445365301cd1b7e34c433addeb3649f886f7642801f97f53ec0f83830b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6456 10808 bytes

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