Malicious PDF — malware analysis report

Static analysis result for SHA-256 f436b86e2a39ffd2…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 14:06:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 57537eb26a039b704fdbed3fc943d2e9 SHA-1: aaaec0561ca11aa16826c5add70d4360e14e27b5 SHA-256: f436b86e2a39ffd2f505d353093e3acfc16a4b115a5c66c6ad4d6a67270091f3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to appear as 'free generators' or 'game hacks', a common lure for users seeking in-game currency or cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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-without-verification-2021-game-hack PDF link annotation
    • http://elib.acls-indonesia.com/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-often-pubg-uc-advance_GM1330123889.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/microsoft-roblox-rewards_GM431946152.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_off0000525e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525E 25900 bytes
SHA-256: 300b01b9e8a1f43215d47e95005336e3023f795c74896ec8cd1a6f3adbb7b0e0
font_01_sfnt_off00008dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFA 19368 bytes
SHA-256: a82984a519d7edf94c6531cfcf7f8df3cbe602e214b877051ae5dee029c294bf

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