Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac34f409d1b77b41…

MALICIOUS

PDF

41.7 KB Created: 2021-05-11 14:04:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 27902606357e9d77b3b021cddd58136f SHA-1: 136052db5cc1c43ab68e37f9ad75e04bb26b643d SHA-256: ac34f409d1b77b4194c74517b3b8063fb7e9076969b7f1f280d47364a6387333
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery 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 0.9971

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://netcdn.xyz/app/406889139/free-spins-and-coins-on-coin-master-game-hack PDF link annotation
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/games-for-robux_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-com-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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FA 24900 bytes
SHA-256: c4917bc3fe9347a27f3c5a3342fe38ff53bed629c7fbbbc26a78c80616af41e3
font_01_sfnt_off00008139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 18060 bytes
SHA-256: 64690fddacb88a1b87eb78a3bf181b542b813998c8d2539429c7660090ba79fa

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