Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b53b168d6e164c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 03:40:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4722f9f385f4a0897ed324223b46d95f SHA-1: 920593246dec99c2dde8791b913db41ad90c3fd8 SHA-256: 91b53b168d6e164cd477c3f3225e80372479bfab57596b8273a50de208ebe63c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'game hack generator'. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

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/coin-master-free-gifts-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-adopt-me-how-to-get-free-oers_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-godly-knives-on-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/robux-game-com_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/wie-bekommt-man-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-rocitizens-money-cheat-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/tiktok-free-jazz_GM835599320.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-help-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
font_00_sfnt_off0000323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323E 23268 bytes
SHA-256: 02517736e218ced7edd3e47d866c386d657ea6149db6f9640d8841b1a3892d78
font_01_sfnt_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 17996 bytes
SHA-256: 0554876b2ab95b57b2a8903cbabfbfa90e4f9f04422ab63317bc25d957b52972

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