Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc54cf9cd2f5ca3…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 18:25:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e7d766c5f9c19210bbaa7dc9e1cf52c9 SHA-1: 2856c10e43121b7a954e61844502896003889baa SHA-256: cfc54cf9cd2f5ca34e4e403e918b4588f1fe1193f81a2b44d19629923de51ad8
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/free-robux-discord-game-hack. This link is presented as a lure for free game currency or hacks, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious, supporting the observed malicious links and lures.

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/free-robux-discord-game-hack In PDF document text
    • http://www.travelone.ae/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/free-roblox-robux-bc-accounts-codes-more_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/hacking-things-to-hack-roblox-gamemodes_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/how-do-i-input-hack-scripts-into-roblox_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/robux-sign_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/coin-master-website_GM406889139.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://www.travelone.ae/userfiles/files/csgo-roblox-hacks-ahk_GM431946152.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_off00002df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF2 21816 bytes
SHA-256: 959040ce7b27673f7f015cce3e7695d935a4c14437ecc6b7d6a9ebd327e9c59b
font_01_sfnt_off00005e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2E 19176 bytes
SHA-256: 020ce166f16710322681f054c1b4dde0a486d6154bce33e9144977aac3b53b16