Malicious PDF — malware analysis report

Static analysis result for SHA-256 39617e18ceabdc26…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 13:31:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f2a9655156295365041e7ac3096e1e70 SHA-1: 320e45cb69a46632571abf7706d301e05ec82128 SHA-256: 39617e18ceabdc26b1432a238ada9ad08f3d4d0a105288d64477e18c29141607
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites that promise game hacks and generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract users searching for cheats. The primary URL, http://netcdn.tw/app/406889139/gamehunters-club-coin-master-game-hack, is a strong indicator of a scam or malware distribution point. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/406889139/gamehunters-club-coin-master-game-hack PDF link annotation
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-robux-genetator-hack_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-do-you-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-ornaments-horrific-housing-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/pubg-uc-and-bp-generator_GM1330123889.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/comment-hacker-roblox-sur-bubble-gum-simulator_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-a-free-hat-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-phantom-forces-hack-script_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-anyne-with-editthiscookie-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-know-if-your-being-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/robux-hack-free-codes-no-verification_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_off00003210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3210 22852 bytes
SHA-256: 3d0b06e87bb1c4699f6431de1fc516cce4f3573e83879fe4632662c4c0956d1a
font_01_sfnt_off00006535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 18632 bytes
SHA-256: 30b5ac21c6a93ecf49da73b5010e4d04aa7628586d8166660ea0a2d873e7b76c

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