Malicious PDF — malware analysis report

Static analysis result for SHA-256 b071cd366a2aaf28…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 09:53:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d025f3faddfa7cd464e677e996be39d6 SHA-1: 57c2d2a24947ae32228f28dc14bb5f5cd19c09b4 SHA-256: b071cd366a2aaf282ad4eb7e88a986d64e8769ce3db8ebfac84a0898459a9d61
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic indicating it links to a game hack generator, specifically mentioning 'Coin Master'. The embedded URL and document body text reinforce this lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack pattern is a social engineering lure to a potentially malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-2021-spin-link-game-hack PDF link annotation
    • http://perpus.stihpada.ac.id/repository/how-to-hack-roblox-accounts-2021-on-pc_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/polyguns-roblox-unban-free_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-dungeon-quest-hack-script_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-vehicle-simulator-money-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/escape-the-supermarket-in-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-script-exucuter-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/robux-free-online_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_002_off00003021.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3021 22956 bytes
SHA-256: 2443ad0a9a41ec4b3ffd39089e3bdfb980b8d2297e1f99516d66674af7754e9a
font_01_sfnt_off000063fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FB 18748 bytes
SHA-256: 96324e6ce0c81689c6b9eecc120e41c8c4a64b67d53a9c8495a7c5a7aa900936

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