Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d497c0645a3a5b…

MALICIOUS

PDF

44.3 KB Created: 2021-06-04 03:38:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3a3eda127078aa0f06f774c2d07165e6 SHA-1: 4f6eca2aa0ce7dfb90e5d10f2cd8cffbf6d21f34 SHA-256: 57d497c0645a3a5b4f6b71ca2f2dae6390c338f2b1f64d623619ad4121836370
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9865

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.online/app/406889139/coin-master-hack-without-human-verification-2021-game-hack PDF link annotation
    • http://library.stikessuakainsan.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/tiktok-free-unblocked_GM835599320.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-free-link-spin_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_004_off00004e4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4A 25404 bytes
SHA-256: 224ff505a85379659bb3b6abb80882c602866dbac822d0bcb40c52548417f32d
font_01_sfnt_off0000883f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883F 19016 bytes
SHA-256: 9d151cd353acbc916f7f6eb107110adb70143b0a6a415e6841dd022ecfd31ccb

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