Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc8af57998cf45…

MALICIOUS

PDF

32.0 KB Created: 2021-06-07 03:41:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3e8c7c4d76ee429a8e981e9b5cc9bda5 SHA-1: 069443205bcd00046e5580f8062a28acdd350d1e SHA-256: 3efc8af57998cf458084111dcdb214b4e0d5d04a0c056c86c4b4f9bc82431352
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links disguised as game hacks and free currency generators, a common lure for phishing or scamming users. The heuristic firings indicate that the PDF links to external URIs and uses game hack lures. The ML classifier strongly flags this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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/murder-mystery-2-roblox-hack-money-game-hack PDF link annotation
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/roblox-password-hacker-online_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/commande-cmd-hack-roblox_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/gui-roblox-dinosaur-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/free-robux-generator-unblocked_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/free-robux-no-verification-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/how-to-hack-into-ppls-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/roblox-hacker-greg_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingowa.pl/wp-content/uploads/fsqm-files/hacks-for-ninja-legends-roblox-mobile_GM431946152.pdfIn PDF document text
    • https://porownywarkaleasingoIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000527d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527D 19519 bytes
SHA-256: 83d0b659de4964766c9fbaa36022059cd24a47e6bd869a8e8c44fec6d054d265

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