Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3cf2e22e5f7b0d…

MALICIOUS

PDF

46.7 KB Created: 2021-06-11 11:52:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a0079318b8e0e6e902758bae0c6a59e8 SHA-1: c95ed821669f5610521dc977955dd9ae923dc0cd SHA-256: bc3cf2e22e5f7b0d82030b7b7f784997809bfb091fb5766aac05a95cb0755256
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, such as the one pointing to 'netcdn.tw', which is known malicious redirector infrastructure. The document's content and embedded links strongly suggest a phishing or scam attempt, likely to deliver further malware or lead to credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/20210-free-robux-daily-game-hack In PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/phantom-forces-hack-roblox-2021x2021_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/roblox-hack-ulimited-robux_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.tradenextindia.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-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
stream_004_off00005105.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5105 27616 bytes
SHA-256: 7618bf6c337bf3b3954927da8b4d4ec4655cc41846cdc57cd3803bfed759e37e
font_01_sfnt_off0000916c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x916C 19184 bytes
SHA-256: cac50435f8de656fd6aaf67102ce83073ce26635d4b361c0059d5fa533a89570

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