Malicious PDF — malware analysis report

Static analysis result for SHA-256 37070f0a97ac31fd…

MALICIOUS

PDF

44.3 KB Created: 2021-06-04 03:46:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1d8af32f03350ecdc451add86a904ad7 SHA-1: 0ba341eb4206a9cd2cd4c7ed7996fd6424faa883 SHA-256: 37070f0a97ac31fdd186fe4607fb3c4022e6297a9db975293b838297bd1c81bd
142 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized to appear as legitimate resources for game hacks and free currency. The primary URL, https://netcdn.online/app/406889139/coin-master-free-spins-hack-link-game-hack, is a clear lure for game-related exploits. The heuristic firings indicate this PDF is part of a link farm designed to manipulate search engine results or redirect users to potentially malicious content.

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-free-spins-hack-link-game-hack PDF link annotation
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000521d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521D 25012 bytes
SHA-256: bd6c89fd54a40e800c3c19628cff44d34c5f1847395a0771c1111cebc1cc56af
font_01_sfnt_off00008b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2E 18056 bytes
SHA-256: 5bc30252b20e252a4e4f12754ee6fd7a8bdc905346c0352a18cf9aa56584dd16

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