Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb0cf8aeb5b112c…

MALICIOUS

PDF

34.4 KB Created: 2021-06-22 22:30:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 18cd7ce32e80920b76e3412c9412b013 SHA-1: a9edd557bc2b51abd8b6050b82357992872d48e8 SHA-256: 3cb0cf8aeb5b112cc906e361a7a791b04beb61d9fdb8d8a02fe5957d179a70c3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) 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 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-sketch-roblox-hacked-client-game-hack PDF link annotation
    • http://kermas.eu/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-gift-card-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/wearedevs-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/roblox-noclip-hacks_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/roblox-cool-free-items_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/hacks-roblox-cambiar-nombre_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/youtube-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-accounts-with-a-link_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/assasin-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/pastebin-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/roblox-hack-new-dtfb-test_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-use-scripts-in-roblox-hack_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_off00002ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC2 22460 bytes
SHA-256: 680efaf2e0ce7755a596fdfa269ff66c6d1377c4d1f36f78cd31893683e21204
font_01_sfnt_off000060aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 19384 bytes
SHA-256: 47f7431213b6d54e96795b5e818fc61ee5d16900dc789b64395819de134bc8c9

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