Malicious PDF — malware analysis report

Static analysis result for SHA-256 a155f634139f9373…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 00:12:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a600bd736997f3da77358ede4a23dacf SHA-1: d38d4cff8c41b86c8d307c826b88ea0385f7fe95 SHA-256: a155f634139f937385496f147f00b70e6f22f24fa9bb2cf34fc6ad3b58e2452e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple lures for game hacks and generators, directing users to external URLs. One heuristic specifically flags the PDF for linking to a 'free generator / game hack' redirector. The document body also contains instructions that suggest copying and pasting content into a shell, indicating an attempt to trick the user into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/citizen-roblox-hacking-game-hack PDF link annotation
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/taste3-com-roblox-online-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/https-rbx-place-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_off000052a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A4 27160 bytes
SHA-256: 74570e22fd673e5ec8c3d1616f9b5ad73c7590cd60a7c1d9ee600d9dfb4aafd2
font_01_sfnt_off00009071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9071 18776 bytes
SHA-256: ae83b2b915cfb219403e428bcfa76199a38dd3fd96a70fc7011d2e8bce352579

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