Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e3381fe4a0b4af…

MALICIOUS

PDF

45.2 KB Created: 2021-05-12 23:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6042f7c05dc03220dca1c281e33c85fc SHA-1: c91478b4168f14520c8b1cd516cb4250c5ecf150 SHA-256: 83e3381fe4a0b4afb58c114afa47e60cb956d1d83e2f01fe41ee36c8ce75cd75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and currency. The ML classifier also flagged this PDF as malicious. The primary lure appears to be related to popular online games like Coin Master and Roblox, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/free-gold-cards-coin-master-game-hack In PDF document text
    • https://repository.umgo.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-cheats-for-free-spins_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47EC 26652 bytes
SHA-256: 12aff29a3978698e0021254ae36e2a4f0d072d6c8a4a5a37a64440c9d676c18e
font_01_sfnt_off00008544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8544 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF6 17960 bytes
SHA-256: e7d6a33110c05f2f7358e31e331cf325c9b09bbae5ece44b659e3c4bfc76bc90

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