Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5669185234a48e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 23:48:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 41d2fe70571bd73116799e76c0a7bde9 SHA-1: b5a576b9bb90dbfab0d15ea0bf9a88cd9277743a SHA-256: 7b5669185234a48ee434f44f47de8f56f8c2f573ab8173e65be481813827e809
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, specifically advertising game hacks and free currency. The ML classifier also flagged this PDF with high confidence. The document body and embedded URLs suggest a social engineering lure to trick users into visiting malicious sites, likely for further malware delivery or phishing.

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-cards-link-2021-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-accounts-youtube_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-bots-allowed_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/tiktok-free-fans-video_GM835599320.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-bc-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-tiktok-video_GM835599320.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-someones-character-in-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/secret-robux-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-admin-2021-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-glitches-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-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_002_off000032c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C9 23036 bytes
SHA-256: d880348f9495cb11d8273d9deca801ed3bc3ffc897252223ed925331f0876dcc
font_01_sfnt_off000065f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F6 18744 bytes
SHA-256: 30a2c575023908b4f2873a2c506cf1dd7d4cce6c2b03b20b5a33b18f82d0ec48

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