Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8744365733941c4…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 22:14:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1a19f4db2771ea0f54ca717b4224156f SHA-1: 0fdcab10107823788b7baf928428468ec37e90c6 SHA-256: a8744365733941c4d151c3dfd56476ac81685f81cc12a6b987005e3e3aeabfb1
122 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites that promise game hacks and free currency, a common lure for phishing or malware distribution. The heuristic 'SE_MFA_LURE' suggests the document may also attempt to harvest multi-factor authentication codes or session tokens. No scripts were extracted, but the embedded links and lure suggest a malicious workflow, likely involving a drive-by download or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.xyz/app/431946152/roblox-printables-free-game-hack PDF link annotation
    • https://vireco.store/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-devil_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/getrobux-info_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-robux-no-email_GM431946152.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_off000048b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48B1 26280 bytes
SHA-256: 12ce66fb673136a02230a385c0502aa2a2699740e46bc1dc6b6d4682c9ae6169
font_01_sfnt_off00008535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8535 18552 bytes
SHA-256: b5ee65cd5901ad7693dfafde0b4a4a2e01b57e67b0b7341f09a29d5f18e40ca4

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