Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1b27af7546db7b…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 13:03:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 177353c197d77678d9139d02fc465343 SHA-1: dec604d7638b628afcb2cb2b2afb671b98eb2bfe SHA-256: 8b1b27af7546db7b04597782c45a44bb7a2587a856b47f956160e3f9717d052f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/blogger-coin-master-free-spins-game-hack. The document's structure and embedded URLs suggest it is designed to lead users to potentially malicious websites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/blogger-coin-master-free-spins-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-free-800-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-hack-2021-on-laptop_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-surf-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/tiktok-free-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-installer_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-stampycat-tshirts_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-fly-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-tener-mas-seguidores-en-roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-a-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-free-roblox-exploit-serverside_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/is-it-possible-to-hack-roblox-in-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_002_off000031f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F7 23292 bytes
SHA-256: 8a809704b8a3c1a955a9df4bfaa1986c01fee54ac1b5df5aae1ddd17f8c98542
font_01_sfnt_off000066ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 18464 bytes
SHA-256: f296297f24d16be59dfb68755b8dea07f16f55f25f89e3d3dbe8c2451ee9dbcd

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