Malicious PDF — malware analysis report

Static analysis result for SHA-256 187e481964021975…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 12:23:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1b187d5f995f06328cfa1a74a9381471 SHA-1: 56b25994458b9a1e0dc5146e1247d221c4119fa5 SHA-256: 187e481964021975a6d237cc9839e3ae3e7eb54a4e0610111ab9134aded4d4e5
122 Risk Score

Malware Insights

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

The PDF document contains multiple lures for game hacks and free currency, directing users to external URLs such as 'https://netcdn.tw/app/431946152/uirbx-club-free-robux-game-hack'. The presence of 'cmd_GM431946152.pdf' within the document text suggests an attempt to execute commands or exploit vulnerabilities. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/uirbx-club-free-robux-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/dora-creates-a-free-robux-scam_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/grab-knife-hack-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/hack-your-roblox-account_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-cmd_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-minecraft-printables-food-labels_GM479516143.pdfIn macro / runtime command snippet
    • https://reggieslockandkey.com/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/make-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-speed-run-4-cheat_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/daiIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005479.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5479 23964 bytes
SHA-256: ecb214403e4dd2f145b3a3cb9a4fae29d0fcaa21bdad8f81447acd1f31ce6c02
font_01_sfnt_off00008b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3A 18396 bytes
SHA-256: 84f625030a7f1f5286ae58a22daaf46a91611d6c747ac63487c4b5e2dd74d257

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