Malicious PDF — malware analysis report

Static analysis result for SHA-256 a771b7eccda658a8…

MALICIOUS

PDF

36.7 KB Created: 2021-05-23 11:44:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aa2db17f38ad708197cf9be8b542b5cf SHA-1: c46aadff3b514010b602d1b37847a24eebb516d3 SHA-256: a771b7eccda658a822127dd33c3dbcaa8b719efeca3cf2a94dfacb5955d4b061
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 malicious score 0.9447

Heuristics 4

  • 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.
  • 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://netcdn.xyz/app/479516143/free-minecraft-worlds-game-hack PDF link annotation
    • http://learningarabic.co.uk/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-redeem-robux_GM431946152.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_002_off0000354b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x354B 25312 bytes
SHA-256: 193e33897a6abae6d926f84bedbb1c17912c743d3d7b01f11bf9293a88a1d928
font_01_sfnt_off00006ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC4 18156 bytes
SHA-256: 664c7195a075aff6dcec565529a8f8eee0b73719923e2c76767f815b88d63ca4

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