Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a2e21cb852672c…

MALICIOUS

PDF

34.8 KB Created: 2021-07-07 07:09:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ecf34d0cb380472a4f7f88c5f6d7bc9e SHA-1: 0f8ed9d19a413fc67e3b3835af632d3c4d3f71bb SHA-256: b6a2e21cb852672c78468045443470406e64ba5fe3bde4c4f325d7415491dc6a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to lure users with promises of game hacks and generators. The primary redirector URL, http://netcdn.tw/app/835599320/tiktok-free-tiktok-game-hack, is flagged as malicious. The document's structure and content indicate a phishing or scam attempt, likely to drive traffic to malicious sites or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-tiktok-game-hack In PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-injector-for-roblox-v3rm_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-hack-glitch_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-robux-hacks-no-download_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/mcpe_GM479516143.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/booga-booga-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/youtube-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-hack-no-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-free-robux-2021-no-hack_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-coin-and-spin-link_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_002_off0000325f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325F 23064 bytes
SHA-256: 120f44c2b59fb9a95b484932e2462fee59e6d5fdeae67c0438321a3a15bad909
font_01_sfnt_off00006631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 17972 bytes
SHA-256: c2ea0ec047dda9dae57c7b6fccb39bb9de8bc1653c054defbe0bc43e3e19fae1

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