Malicious PDF — malware analysis report

Static analysis result for SHA-256 85431e3bccee14b3…

MALICIOUS

PDF

32.9 KB Created: 2021-07-08 22:42:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 248feccdb24f6cc50ed5f6236e6bca0a SHA-1: c79040f8322ad12ff1a7d7335a4e138990e3405a SHA-256: 85431e3bccee14b37290216b5f618ad3dd640ea7dead2cbefd4e1fca80f02682
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/free-online-generator-for-coin-master-game-hack, which is flagged as malicious. The document body and embedded URLs reinforce this theme, suggesting a social engineering tactic to drive users to potentially malicious sites. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or scam attempt.

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/free-online-generator-for-coin-master-game-hack In PDF document text
    • https://yowchang.com/image/data/files/invicibility-roblox-hack_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-hack-unlimited-robux-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-dbz-legendary-powers-hack-script_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-items-on-roblox-android_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-all-gamepass-items-in-roblox-nypd-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/dumbdog419playz-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-admin-commands-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/pants-roblox-girl-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/cheat-invincible-roblox_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002dd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DD3 21956 bytes
SHA-256: aaddf329ed74924f50e55843ace05c847b691ea4452fcb9951227851e70f7885
font_01_sfnt_off00005e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 18072 bytes
SHA-256: 9b9ca6a1ebabc5184410020ce6f00603c34c06d6c59453e1e72546e3244d6c52

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