Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c13cc18f19bfbd…

MALICIOUS

PDF

45.6 KB Created: 2021-05-12 10:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7aca902aa96fff93b36bce6d63e663c0 SHA-1: 53a4e1d5460b8a5f32e2e51d1e320e756158f93b SHA-256: c3c13cc18f19bfbd8a3c930651ca71e2a4e45c99e39839e37c193054ee3fc225
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a 'link farm' by heuristics, pointing to game-related lures like 'free generators' and 'game hacks'. These links likely serve to redirect users to malicious websites or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious intent to lure users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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 https://netcdn.xyz/app/479516143/free-online-games-like-minecraft-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B8A 26320 bytes
SHA-256: ff529eb8c6748ad120f6697559183f69141efa4e7a22dce2cd9de327b8111101
font_01_sfnt_off000085c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C5 3092 bytes
SHA-256: 3811f2fb1880daf4953efcc9c7427d9b438bced237490b00be4a6ec3ecea79e0
font_02_sfnt_off00009070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9070 18072 bytes
SHA-256: 246b849e2f56f6dfbc2c344cbb2402d5c34ee1f8458d292b794ed9a5a308c484

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