Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb111d080bcf000…

MALICIOUS

PDF

33.5 KB Created: 2021-07-09 12:00:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f89755a18c749b118eea690b186e7903 SHA-1: 4a1d3537369385da7e02f047fb352c7da1fdd2ac SHA-256: 6bb111d080bcf0004fbd338017db46f76c52003095723be9b2da17c5a6e1a414
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The document body and extracted URLs reinforce this theme, aiming to lure users to click through to potentially malicious sites. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a phishing or malware distribution 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/431946152/tower-of-hell-roblox-hack-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-ro-ghoul-cheat_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-hacker-mask-on-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-jailbreak_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/youtube-cheat-central-robux-july2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-buy-pubg-uc-in-india_GM1330123889.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/pastebin-download-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-copy-and-paste-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/google-only-roblox-items-free-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-font-free_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-from-ads_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-tiktok-followers-without-human-verification-2021_GM835599320.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-enable-the-free-models-searcher-in-roblox-studiuo_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/get-free-cards-for-coin-master_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
font_00_sfnt_off00002ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF8 21264 bytes
SHA-256: d9fc993acea56e53a9a47dd12a9cf72b7481a279802d984246c81dcc5142cb5b
font_01_sfnt_off00005e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E27 18820 bytes
SHA-256: 67d90ccee3cd81d7870baf8fe8d56c7f414bb1df208bdee94fd199bc15d066f2

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