Malicious PDF — malware analysis report

Static analysis result for SHA-256 10427771c3cc9d4a…

MALICIOUS

PDF

39.3 KB Created: 2021-05-10 13:47:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fcbcbf69d9faf4ed5932b590bd6e4634 SHA-1: d60dbdaea89691b3f31b38a3896c49ff85d9e18e SHA-256: 10427771c3cc9d4a853d4caf99aa9456073448d4bd71b8174bc8eb6cc873adee
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 0.9574

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/406889139/how-to-hack-coin-master-using-es-filer-game-hack PDF link annotation
    • https://dr-willmer.de/images/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://dr-willmer.de/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://dr-willmer.de/images/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.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_off00003c80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3C80 25972 bytes
SHA-256: b93395132a77b289f26504da1a904315e20d82dae6ade1a328ee7374a37f2d94
font_01_sfnt_off0000773b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 18592 bytes
SHA-256: 7b6829f0c912f355393962c39643cd2cadf5d604c17bb92301d7763a729473f1

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