Malicious PDF — malware analysis report

Static analysis result for SHA-256 4011cc75f2d72563…

MALICIOUS

PDF

36.9 KB Created: 2021-07-06 08:03:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 26d5f32670dd81eded08bb6acf2f453d SHA-1: 0738d48c47c6eb666fa335ce8a5d0309215f111e SHA-256: 4011cc75f2d72563c745716823a25008786ebaecfb74b9d76450c2918e27c2f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a link farm, that redirect to sites offering game hacks and potentially unwanted applications. The primary lure appears to be related to 'Coin Master' and 'Roblox' game cheats. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to malicious or scam-related websites, likely exploiting user interest in free in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 4

  • 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.
  • 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/download-coin-master-hack-apk-game-hack PDF link annotation
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/tiktok-bots-free_GM835599320.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-get-free-robux-2021-no-scam_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/robux-link_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-when-bloxburg-will-be-free_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-robux-auto-human-verification_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-robux-hack-on-pc-2021_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/games-that-actually-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003391.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3391 23752 bytes
SHA-256: 2b1bb57cac493fb3d4994493ef7be67851d22f3b5c799a867a0bf78b25b47903
font_01_sfnt_off0000697d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x697D 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00007362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7362 18760 bytes
SHA-256: a9106ec8bdb2ef00eddd29af2fd5eb663302a9539c133b1226910953e26aec8b

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