Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e75b87b88cc999c…

MALICIOUS

PDF

44.1 KB Created: 2021-06-13 23:47:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f75713cc388323e594e70b3efcb836a9 SHA-1: c0c6ba5f4ac9c5ab0bc7d458555d57f5ab5e1095 SHA-256: 3e75b87b88cc999c2471365292a6303b8a4773d1bbe159fb3318aca082f3ad2a
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://netcdn.co/app/431946152/comandos-cmd-juegos-hack-roblox-2021-game-hack PDF link annotation
    • http://torkelson.se/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/roblox-devil_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-us_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/free-bc-roblox-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/wwwhacktoolcom-freedownload-roblox_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-hack-no-confusion_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-spins-for-coin-master_GM406889139.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_003_off00004999.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4999 27112 bytes
SHA-256: e3e7f330ca04d4f389591489416f7428a66f65b9f49e8f94703ceef664ce994e
font_01_sfnt_off00008625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8625 19612 bytes
SHA-256: c4799a81097c6a9c3b85d81db4a9b4504886fc1b01f2fa8a5439607f04fca84d

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