Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4ff214cdc1d7e7…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 23:18:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b7cb4850af6a96c153c2285c562db463 SHA-1: d87023cf47c851b35ba647f57231dc03524d8c1e SHA-256: 8c4ff214cdc1d7e79d418b8e2a9a447211ab830715a3439a7e25d6830594f3e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/835599320/tiktok-free-quality-game-hack, which is associated with redirector infrastructure. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for further malware delivery or credential harvesting.

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/835599320/tiktok-free-quality-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/booster-game-pc-free-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/grab-points-login_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-welcome-to-bloxburg-money-cheat-july-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/http-bitly-coin-master-free-2021-spins_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/cheat-engine-wont-work-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/are-there-cheats-on-roblox-arsenal_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-pro_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-exploits-roblox-reddit_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/rbx-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
font_00_sfnt_off0000324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324F 22748 bytes
SHA-256: f85edaf045952094b9bcbc65678fcdb2d1fb7d08ccec46046fc5aac8f4609f07
font_01_sfnt_off0000655b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655B 18524 bytes
SHA-256: 99e7fc799f6050ac523341aa7d9c5eba4959689518195ddbafb016cd5e4e2841

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