Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41b175cacafbf0…

MALICIOUS

PDF

33.7 KB Created: 2021-07-08 01:09:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 014b4899f8e4567a41b44eaf540a5244 SHA-1: 71ce7985acf6aad089a6fa71a43ac5ce59df1b7a SHA-256: 3d41b175cacafbf0d6194d5e6023e93540b4b99aaee46a5eec33b7eae739112f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for game-related cheats and free currency, directing users to a known malicious redirector. The document body contains multiple URLs, including the primary malicious redirector, which is a common tactic for phishing and scam campaigns. The ML classifier also strongly indicated maliciousness.

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-heaven-free-spins-link-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/completely-black-shirts-roblox-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cheat-engine-bypass-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-for-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-pc_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_002_off00002eb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EB8 22312 bytes
SHA-256: 02146814ecd947d7e5ee30ab84f3be1ea50fd0c10c78aa8528ca694ed43ef7b0
font_01_sfnt_off00006045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6045 18460 bytes
SHA-256: 9b0749f4ce3cc6ef8d94274498cbad61dbe97f6b94b6ff37cda003e795bdfc4f

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