Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f41006f8872438…

MALICIOUS

PDF

35.1 KB Created: 2021-06-20 12:42:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a73a59c56820d9c0362b8d0f2146736e SHA-1: 28d0597aed2e94ab809fd94ca43090519462d1ef SHA-256: b7f41006f887243829cbbb0088d7af23be9e58a1c7194021f4be8a82680e61bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game items and hacks. The primary redirector URL is http://netcdn.co/app/431946152/roblox-free-promo-codess-game-hack, which is likely used to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a malicious intent to lure users to harmful sites.

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.co/app/431946152/roblox-free-promo-codess-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-dinosaur-simulator-free_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-5-bil-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/cheat-engine-roblox-2021-work_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-speed-race-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-cheat-engine-bypass-june-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-spins-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_off0000311c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311C 22660 bytes
SHA-256: 9e28751aaec9871cf4e261fb910f9d703ea27d5bb6578198bd87deef0710cb02
font_01_sfnt_off000063d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D1 19236 bytes
SHA-256: e7a5747bcd86349586f72c918deb9a3ac805a2912649b4b5cba7e6f4ccbdcf87