Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e3fc79e14b491f…

MALICIOUS

PDF

51.5 KB Created: 2021-06-08 23:12:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9b1fa19fdbbe561705b228914600fc70 SHA-1: 10e8013c906f3319a62e3162d2289f7a80dfd6c6 SHA-256: c1e3fc79e14b491fd787f1f049828e24733807a22c224b62e99fbf5c56e8ecec
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 0.9327

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.tw/app/431946152/click-here-now-for-free-robuxs-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F2 32564 bytes
SHA-256: c6112e27fe37e560a54c9f80946bc99df62f1a276e0f73d2c41afe6d530e0c64
font_01_sfnt_off000099a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99A6 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000a64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA64D 18540 bytes
SHA-256: 4b748ded941d5b3af82ca7c66a523e54e0479c0a4fb55e99e489741f0c7d9582

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