Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad3f5d08f10d91f…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 09:55:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3c2f72f9f19b01f47dca79ed2ee8afb3 SHA-1: 556e7e1356646155d4f5daa40a53f13c8f404615 SHA-256: 4ad3f5d08f10d91ffdbd853ffe5816b2c5f555252bc246f178bb94fa36f46836
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as game hacks and generators. The document body, though partially corrupted, contains references to these lures and the primary redirect URL. The presence of embedded URLs and the critical heuristic firings strongly indicate a phishing or redirection attack aimed at leading users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.tw/app/431946152/how-to-hack-in-tower-of-hell-roblox-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hack-download-ios_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/cheat-engine-roblox-super-speed_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-in-inspect_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pokemon-go-free-friends_GM1094591345.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-and-coins-coin-master-2021-link_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_004_off000050cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CF 25044 bytes
SHA-256: a1501bd00849f6d3a9e13b0e00b336a5dbd39fc0078bf885bdb4b1f536b73465
font_01_sfnt_off000089e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E5 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9384 18344 bytes
SHA-256: 25d7fa8ded2dd4b8ba9d0c4975be7ba7c1f0d7f31b54700ce9b4d6a9aa0c8f97

Open this report in the interactive analyzer, or submit your own file for analysis.