Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2b8cedfe76b61d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 12:37:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d366b711bb84722384dba634b6668f16 SHA-1: 49a5fab0d48f733e25587ecec5e1b0110668b39f SHA-256: 9f2b8cedfe76b61d06a23170e84d9427a5dde12ce9205beee3aa687552c525e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that lure users to websites offering game hacks or generators. The document body and extracted URLs suggest a phishing attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of embedded URLs and the nature of the lures indicate a social engineering attack.

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/hack-coin-master-game-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/script-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/tiktok-free-roblox-accounts_GM835599320.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-item-list_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/dragon-ball-rage-roblox-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/cheats-codes-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-free-robux-no-download-or-survey_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/mc-update_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-hack-easy-and-fast-website_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-generator-codes_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_off00002fc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FC2 22852 bytes
SHA-256: 0412f8ef29594508d0f78cc50c0f3929f56653d2157466aacf6feaaa6f479406
font_01_sfnt_off0000631b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631B 18264 bytes
SHA-256: 8f2dd24b0014e13e2498ac22d14630d728521917f99c293e3a9862637116b811

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