Malicious PDF — malware analysis report

Static analysis result for SHA-256 25df79c12e3d0fad…

MALICIOUS

PDF

37.9 KB Created: 2021-04-22 15:52:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d2c0d042a82a8a578d1fedaae664ae4 SHA-1: ff6f770ef01f944c4746dcc0a6d81f50ac028b3b SHA-256: 25df79c12e3d0fad5d101342409ffb89d3a4ea8970e62004b24cfc9b2d1272e4
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious. It uses an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0461

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netsecure.pro/app/431946152/free-model-roblox-eggs-game-hack PDF link annotation
    • http://www.dynamitbogen.dk/billeder/cheat-engine-roblox-weight-lifting-simulator.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003665.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3665 27252 bytes
SHA-256: e63cf72080fa1b2bd241fc2b614f04a208ca863d238ecc1fd29f5b0c7f61b438
font_01_sfnt_off00007204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 18608 bytes
SHA-256: 06f9ebb9feef88b87fd1528dcd4cff865a37863ab7995a8854b30ed6f8a496b7

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