Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f875ca66bcd2164…

MALICIOUS

PDF

42.8 KB Created: 2021-05-10 16:31:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 54db4b6c151a33315e1d3426ea87faf6 SHA-1: f04763591e0e3a1c0f13aeccf8745bc6cb555faa SHA-256: 8f875ca66bcd2164027b8a9896fab1c5c057798aa2217dbe2ddb3a95d081913c
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 0.9971

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.
  • 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 https://netcdn.xyz/app/406889139/free-spins-for-coin-master-ios-game-hack PDF link annotation
    • http://slim.sisminkada.net/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coin-master-game_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
stream_003_off000049c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C6 25820 bytes
SHA-256: f5a9d052dcb096586ea94c63a2002b0d01712222f0129b47c342b3b7811fffde
font_01_sfnt_off00008614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 17884 bytes
SHA-256: d6e90866c30832384271063124a5c9cb80fb52483677f44d0692746c0ffe6ea3

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