Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be692d319286675…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 11:35:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 894b015b32f5f65e1a926571bbf2dee4 SHA-1: d16748b2c4e4596da7e56cfcd74296862fc0bcb9 SHA-256: 4be692d31928667572294da150070e364e58510102755ff4f2c4c9d9496529d9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a game hack or free item generator, which is a common lure for malicious content. The primary redirector URL, http://netcdn.tw/app/406889139/free-spin-and-coin-game-hack, is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, 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/free-spin-and-coin-game-hack In PDF document text
    • https://mbbs.hr/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/2021-february-roblox-noclip-hack-for-prison-life_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-instantly-get-free-robux-in-roblox-2021-oprewards_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/robux-hack-pastebin-working_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/sysnaspe-crack-free-2021-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/pokemon-go-free-808_GM1094591345.pdfIn PDF document text
    • http://mbbs.hr/files/free-item-codes-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-best-robux-app_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-cheats-2021_GM406889139.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
font_00_sfnt_off00003177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3177 23840 bytes
SHA-256: 82c7a2bbc3fb3e54f8689a00052a3c86474c0cba56e4f68573d822bcd532a2cc
font_01_sfnt_off00006779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 18244 bytes
SHA-256: 1760058a9b4ac65e75107fdb05ced4e329212cd08f375451f5a371d24b39a496

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