Malicious PDF — malware analysis report

Static analysis result for SHA-256 63435940e800cc22…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 00:40:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 10c11f4c8b6e4a99b2d10a6fae061bda SHA-1: 03579b735b211daf81a4c76b647408d17871f0da SHA-256: 63435940e800cc229ea521ea47080dffed0d243644659a8b289666dad0701e94
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to domains associated with gaming hacks and free coins, suggesting a lure for users interested in such topics. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI heuristics further supports a malicious intent. The document body, though partially corrupted, contains text related to 'Free Coins Coin Master Link 2021', reinforcing the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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-coins-coin-master-link-2021-game-hack
    • http://pustaka.bbppketindan.info//repository/roblox-com-hack_GM431946152.pdf
    • http://pustaka.bbppketindan.info//repository/free-coins_GM406889139.pdf
    • http://pustaka.bbppketindan.info/repository/how-do-you-hack-roblox_GM431946152.pdf
    • http://pustaka.bbppketindan.info/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://pustaka.bbppketindan.info/repository/roblox-gift-card-online-free_GM431946152.pdf
    • http://pustaka.bbppketindan.info//repository/coin-master-free-in-app-purchases_GM406889139.pdf
    • http://pustaka.bbppketindan.info//repository/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • http://pustaka.bbppketindan.info/repository/coin-master-cards-free-cards_GM406889139.pdf
    • http://pustaka.bbppketindan.info/repository/rbx-earn_GM431946152.pdf
    • http://pustaka.bbppketindan.info//repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdf
    • http://pustaka.bbppketindan.info//repository/coin-master-free-card-link-today_GM406889139.pdf
    • http://pustaka.bbppketindan.info/repository/free-spins-coin-master-no-survey_GM406889139.pdf
    • http://pustaka.bbppketindan.info/repository/hack-coin-master-download_GM406889139.pdf
    • http://pustaka.bbppketindan.info//repository/free-robux-safe_GM431946152.pdf
    • http://pustaka.bbppketindan.info//repository/minecraft-free-download-windows_GM479516143.pdf
    • http://pustaka.bbppketindan.info//repository/is-minecraft-dungeons-free_GM479516143.pdf
    • http://pustaka.bbppketindan.info/repository/new-free-spins-coin-master_GM406889139.pdf
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-xyz-download-free_GM406889139.pdf
    • http://pustaka.bbppketindan.info/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdf
    • http://pustaka.bbppketindan.info//repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aaf.bin
abec5725852c1920f61d84540eb5aaaa533b00e7fb42c0dae6c7f1041579ee96		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAF 24920 bytes
font_01_sfnt_off00008443.bin
0befb7fb80ec939a94ee4878df3159d75093faaca76bf929c3a9ca9c0862c597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8443 18284 bytes

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