Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b21c05c486521a8…

MALICIOUS

PDF

51.2 KB Created: 2021-06-03 07:45:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 12d72372b7b1f2e67e1e9c461618ed2a SHA-1: 7ccf938474109ca692feee9683e858055a81aff9 SHA-256: 1b21c05c486521a8f5bb1da2cbe6a33476c451e1178ea7ef8f7f8bae0fdce5b7
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a prominent link to a 'free generator / game hack' which is a common lure for malicious content. The document body, though heavily obfuscated, contains references to game hacks and URLs that reinforce this social engineering tactic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a malicious link, likely leading to a payload download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/free-online-spins-coin-master-game-hack PDF link annotation
    • http://opac.stieimalang.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-games-on-the-top-page_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-paintball-cheat-codes_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B8 25816 bytes
SHA-256: 0eae17282ba64223a0d6dc7075056f7707f4935a656e268f50323971ed195a13
font_01_sfnt_off00008eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB5 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off00009c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C58 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA648 17960 bytes
SHA-256: f6240ebc11618f9bd58bbcb42a9f6a607c152d748d208013faf540cef68a2ab0

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