Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bfdc9aa3ed5839…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 05:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4c5e00bbc3e4c3cf6ac35273f5e0231e SHA-1: 435087bd6bdc91091b027b1ace31500bbbfa2438 SHA-256: 64bfdc9aa3ed5839841fe5ea27913bf5b25de163e075f7abb826f615a1b3be2c
102 Risk Score

Malware Insights

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

The PDF document contains multiple links and a lure for 'free Robux' and game hacks, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. The document body, though partially corrupted, contains references to 'free Robux' and the wkhtmltopdf tool, suggesting it was generated to appear as a legitimate offer for in-game currency or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/431946152/free-robux-2021-game-hack PDF link annotation
    • https://library.sdksantamariabwi.sch.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/pokemon-go-free-90-fps_GM1094591345.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/cheat-codes-for-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_004_off00005137.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5137 23800 bytes
SHA-256: 8b8dcfc7575fdde6a2baf5c597a04bc83d62ef6178779a387b7acfcdd9821d7e
font_01_sfnt_off00008712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8712 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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