Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b6e0aa5e86e269…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 06:59:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5d749d46cedbde4a5d91e943992868f2 SHA-1: 4a19e62b60afd96589b3776d80e0a723b5d60734 SHA-256: f3b6e0aa5e86e2694150465f0f190bf5f206dfb9d3a14b0d64fe5e14ab946223
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a website offering 'game hacks' and 'free generators', a common lure for malicious content. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to a further stage of infection or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/minecraft-windows-10-hacked-client-game-hack In PDF document text
    • https://3qblocks.com.tw/image/data/files/_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-version-apk-download_GM406889139.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_off0000533e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533E 25272 bytes
SHA-256: e31502309f14055af7386753cc147be284516e9cbb33ede56764578783cc98d1
font_01_sfnt_off00008c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3C 18768 bytes
SHA-256: f9a71ab68452ae4ccd094805e59123059ba28481ac44c73a337d9a6d18fc1d00

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