Malicious PDF — malware analysis report

Static analysis result for SHA-256 87378db075609400…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 19:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6c6946948ea85ff9164249773d9622a6 SHA-1: 28a637c2a52671b7d1b07b8ad388be514538d842 SHA-256: 87378db0756094005fe7bc8e4ba9ca8626bb7b62f5942d0ec4fd51dca939103f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, identified as a link farm, that redirect to websites promising game hacks and free in-game currency. The primary lure appears to be related to Coin Master and Roblox. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml-game-hack PDF link annotation
    • http://perpustakaan.bkkbnkaltim.id/repository/the-cheat-code-in-roblox-wonderland-games_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/one-piece-millenium-roblox-stats-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/which-are-the-best-free-level-7-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/get-free-clothes-from-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/cheat-codes-for-building-simulator-roblox_GM431946152.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
font_00_sfnt_off0000343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x343F 23008 bytes
SHA-256: 61942b74c4ded08bb541fe54025596191de42eaeb1ea081ee2517bff1d8f00f1
font_01_sfnt_off00006815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6815 19576 bytes
SHA-256: 1f6fe90e29780f620c300caf81dd3dc0229f82e574bfd1c4d8b0942b4ac7233e

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