Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ae53d4e82bb925…

MALICIOUS

PDF

44.2 KB Created: 2021-06-04 00:18:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8a8406c7adb81d870a27de5a757f3345 SHA-1: eff8582672a34b6ced533166fd982c5715b667c3 SHA-256: 03ae53d4e82bb92514d1faefb1c4f8aff6dbe91e1a6c50d1ea811cf05bb0db30
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/free-coin-master-spins-hack-game-hack PDF link annotation
    • http://library.stieyapan.ac.id/repository/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/client-minecraft_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-no-human-verification-2021_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_004_off000052b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B4 24644 bytes
SHA-256: 176db3a6a7c537d2b89cf898588900d647455ccdb6a7155f7c693b8800b44f50
font_01_sfnt_off00008b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B20 18056 bytes
SHA-256: f725990d5fed63e1f752cd5da267adcbdaa8fd4a8ffcceaffe107e4d98227419

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