Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b7d20c77b65cbb…

MALICIOUS

PDF

34.1 KB Created: 2021-07-22 14:57:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1d1e3417f494c72f09e5e202a8c9dd64 SHA-1: e5cf30ca46ebb3cc25c6cc8ac0f0236153412cf8 SHA-256: a4b7d20c77b65cbb499945efb96af13e80c436e51b33e13d52d08612af669e04
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 0.9955

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 http://netcdn.tw/app/431946152/robux-com-free-robux-game-hack PDF link annotation
    • http://muko-unterfranken.info/images/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://muko-unterfranken.info/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://muko-unterfranken.info/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://muko-unterfranken.info/images/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-tiktok-likes-no-human-verification-or-download_GM835599320.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_off00002e82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E82 23316 bytes
SHA-256: fa46682c159f186a2a3b4443c36f3d6e591608c1680365ea4dceb53cc9d4701e
font_01_sfnt_off000062ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 18460 bytes
SHA-256: 4a32e366c4d91d7d134c7dbb73cf2529d0f331c5de2309c0ca0f4850ac867bfa

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