Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e43c080fb4b46…

MALICIOUS

PDF

43.0 KB Created: 2021-05-13 18:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8b6a14ffff2415f25a3a8cda4e139a2a SHA-1: fe8b42b82c4b001ef3d54de9040797ce32876ad8 SHA-256: 284e43c080fb4b469d16c77e7fdcd88ac4006e288655b5dd179591daa5c7cce9
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a 'free generator / game hack'. The ML classifier strongly flagged this PDF as malicious. The presence of embedded links and the nature of the lure suggest an attempt to trick users into visiting a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-get-free-coins-on-coin-master-hack-game-hack In PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/dailyrobux_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/mc-update_GM479516143.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/roblox-scam_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_003_off00004cee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CEE 25192 bytes
SHA-256: 9562f026e9abcbc899a4ac0bffb100b45798011f32ccec84096709da91022312
font_01_sfnt_off00008686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8686 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634

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