Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1316f425d5ed6a…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 18:42:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 252d71fc6e88a188b6f4c77c226ddbdf SHA-1: abf3ac1619cbf55028024d6e921a1433e5c0e585 SHA-256: 8c1316f425d5ed6a63d56e27a0bdd3f6d977a3fd7cef937267b8ea2a8022366c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a document body that explicitly lures users with promises of game hacks and free currency for popular games like Coin Master and Roblox. The primary link, http://netcdn.tw/app/406889139/how-to-get-free-spins-and-coins-in-coin-master-game-hack, is flagged as a redirector for game hacks. This indicates a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the overall pattern suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/how-to-get-free-spins-and-coins-in-coin-master-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/code-roblox-for-account-hack_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-audio-upload-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/april-2021-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-can-someone-hack-roblox-account-frim-discord_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-hack-2021-noclip_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-2021-november_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/can-your-computer-be-hack-playing-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-for-no-money_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
stream_002_off00002f51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F51 22740 bytes
SHA-256: 746b0c3f112b2e789dcaf7976795e84084df6718ba615213b8a156499a1b1097
font_01_sfnt_off0000623b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 18512 bytes
SHA-256: 54df8a09cf421af6cac57c3a8dff085e717b90c55c616740be0d1644a88c75b3

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