Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd508bfb2db413c3…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 00:46:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 873d1a397dfe241085265b87634a956b SHA-1: c7b813e94d5d5577b98cf47282f3b7d1c0f6f2c5 SHA-256: cd508bfb2db413c3c795a292f0085f44530187bdee3ce91ca410ad53a37bf77f
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body also contains this URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs and the nature of the lure suggest an attempt to trick users into downloading or executing a malicious payload.

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/406889139/apk-hack-coin-master-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-gear-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hacker-for-roblox-https-meganz-nfpdms5k-q8b-1b9y_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-prison-life-v202-gui-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/robux-hack-no-verifaction-or-passord_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-free-items-generator-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/make-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-simulater-kit-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/como-ser-hacker-en-roblox-jailbreak-2021-mayo_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/tiktok-free-music-library_GM835599320.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_off00003257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3257 22892 bytes
SHA-256: 234a7f9219ea21ff054c91b06e6da209ca10c3c5d8a2d111db3159f201db7529
font_01_sfnt_off000065de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DE 18180 bytes
SHA-256: bbc4eac059efcf8bf1e74c2581f3a6bb8c6757dc141f09cf3b32e8008e1b5aa4

Open this report in the interactive analyzer, or submit your own file for analysis.