Malicious PDF — malware analysis report

Static analysis result for SHA-256 845274caf02005c4…

MALICIOUS

PDF

43.2 KB Created: 2021-05-11 07:33:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 171494afc6f43285688024f171498f79 SHA-1: 30ba3e4c88cefd9fad595e75beedf28c975e1b51 SHA-256: 845274caf02005c4600ca4746995ec460e560667857c79a84b0bc0d6bf272cfa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/406889139/master-coin-free-spin-daily-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-get-free-spins-and-coins-on-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_off0000493f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493F 29188 bytes
SHA-256: 5a9f2991737e6936df7efe6789df0a5398b412fb28ea87e4e576a16a5a99e56f
font_01_sfnt_off000086ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AB 18308 bytes
SHA-256: 29cb14730145ee7b34c09c890f7b8837377acbe26d0b8b5df788708214c202fb

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