Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9b91d43913e2c9…

MALICIOUS

PDF

47.9 KB Created: 2021-06-09 11:49:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1f26827d4f29a60e1d13d3ee986ad15a SHA-1: 0eeb3b92b27ae895b133ad2de2efa8c40762f58d SHA-256: dd9b91d43913e2c9b8d244f1be7ffa8ea24f8ce8619680db55d0cd9ec8ff33ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free generator / game hack' lures for popular games. These links likely lead to malicious websites designed to trick users into downloading further malware or revealing personal information. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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-get-hacks-for-medieval-warfare-roblox-game-hack In PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/tiktok-free-overlays_GM835599320.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/actual-free-robux_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_004_off00005429.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5429 28220 bytes
SHA-256: 30872b10855bfd6f6c0872b38ebad72ead4467b262c8341b81750f583ae7227b
font_01_sfnt_off00009592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9592 19416 bytes
SHA-256: c7788e645c6e2221fcd9f5144a2c643ca98b5dcb126ac922b7ad3a2ba4ea030f

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