Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90683ace466e619…

MALICIOUS

PDF

48.7 KB Created: 2021-06-11 06:35:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 408d3ab4412de4ecb5759fda4ccd5fd3 SHA-1: eb8bb5d580e39e51a59bf1ab0f927321db1fdf74 SHA-256: c90683ace466e619a13e36abf48356e509ef3b69ee0d3a15ad99ce6cf3021007
122 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'game hack' and 'free generator' which directs users to a malicious URL. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command-line related terms within the document body, suggesting an attempt to execute commands. The ML classifier also flagged the PDF as malicious. The primary IOC is the external URL which likely hosts a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-use-cmd-to-hack-roblox-game-hack PDF link annotation
    • http://digilib.uim.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-para-dragon-ball-rage-roblox-2021-android_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-jailbreak-money-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54F3 25344 bytes
SHA-256: 1c7e0291e472fbdabf8d00b2f8c6f19924d0d55eb0343679b42b1d8cf97f43e6
font_01_sfnt_off00008f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8D 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9977 18968 bytes
SHA-256: 23c5bc01822c142bc2a1268656bf58359fd516de97bda53da29998d8e477a59b

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