Malicious PDF — malware analysis report

Static analysis result for SHA-256 723928999826d4c6…

MALICIOUS

PDF

35.1 KB Created: 2021-07-01 20:29:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 93c9461d68528d097f27244b2a0c81b4 SHA-1: 3efaefc93077e13c482288adc408acdd577446e0 SHA-256: 723928999826d4c6c52b1d425f296c4980eb0f2f52196a26850f4cfeb55ad1ef
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and game hacks, directing users to a URL that likely serves as a redirector or hosts a malicious payload. The ML classifier strongly indicates maliciousness, and the presence of multiple embedded URLs associated with game cheats and generators supports a social engineering attack pattern. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit user interest in free in-game items to initiate a download or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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/roblox-fun-com-free-robux-game-hack PDF link annotation
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/minecraft-client_GM479516143.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://pelatihsenamjogja.com/ckfinder/userfiles/files/coin-master-rewards_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
font_00_sfnt_off000031db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DB 22684 bytes
SHA-256: 6fb1c9c2d765fe7f0adbb883228225063219ca8f5c63fd76a861ecf277b0a8d7
font_01_sfnt_off0000647d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647D 19052 bytes
SHA-256: 3b2abcc7aa29ca008ea5e4cc3b72e95e65b47650fe7c616c7ae72cc37841b392

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