Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50632b430e073d2…

MALICIOUS

PDF

36.2 KB Created: 2021-05-21 17:12:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 47103367fb4840eb9755965e9826f195 SHA-1: d5be1c59f31dcb0dce7b00a55dd19722df78075c SHA-256: f50632b430e073d2d59ae5a0149dce092ce2790db47f609e2338d2478040b02f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as a "Coin Master Hack" generator. The document body and heuristics indicate a lure to download or access external content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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.xyz/app/406889139/coin-master-hack-activegamer-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-minecraft-alts_GM479516143.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_off00003550.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3550 23988 bytes
SHA-256: c60bcf6606bc6db465d33942e529c283fb122ef568c09e0940f1287bbdb16f39
font_01_sfnt_off00006bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 18376 bytes
SHA-256: 7942159ea88d166bbca90a684af9c7642873a6db171e4c543e33bc315b6ed94a

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