Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f916c3b3cf7b91…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 07:04:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3bb7727fc1328e54b1eddc7ec8788169 SHA-1: d887b1780937270b0bd62dbdaf2fc779f7847edc SHA-256: c4f916c3b3cf7b912555e19a015fb86ebf53ecb0492073eebf8fddcbae8947ff
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 generator' or 'game hack' lures. The primary redirect URL is http://netcdn.tw/app/431946152/https-www-free-robux-com-game-hack, which likely leads to further malicious content or phishing pages. The document body and embedded URLs reinforce this lure, aiming to trick users into downloading potentially harmful files or visiting compromised sites.

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/431946152/https-www-free-robux-com-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/100-working-robux-hack_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux-2021-codes-in-game_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-hack-someones-account-on-roblox-vr3million_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
font_00_sfnt_off00002d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D65 21956 bytes
SHA-256: 6cc2ff02d6354700b7e35ed1c7b5d1732c2be3c3745a5c097e25f586538f0760
font_01_sfnt_off00005de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE5 19432 bytes
SHA-256: a51caaaa6f66b602306ff70a8747ffe07aacd7caa6c5b71e02a2e35f1c5b874b

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