Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd411e7f421fc49…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 16:38:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 23f40559aeaa7986e2f7aaec12188b5d SHA-1: d0b639f77cfe7c3e6f479f201fc775662478aa9c SHA-256: bfd411e7f421fc49a6a2d91fef3154e03ccf82f3a92a7079baa91eb312e53314
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure, including a primary link to 'netcdn.tw' disguised as a game hack generator. The document body and embedded URLs suggest a lure for free game passes and game hacks, aiming to trick users into visiting malicious sites. The ML classifier and specific heuristic firings strongly indicate malicious intent, likely for phishing or malware distribution.

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/how-to-get-free-gamepasses-on-roblox-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-dovlovot-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/star-wars-lightsaber-roblox-free-level_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-coin-master-hacks_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_off000036eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36EB 22320 bytes
SHA-256: 5313d8890c4bb9ab5b0cdb1af1bcbf14121cd927287e3e5ff32dfa9dabe57cb6
font_01_sfnt_off00006860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 19356 bytes
SHA-256: c4896df15a0e6a62920d63d504b7f77c5e25ec731e2dd301a46ee6934e748c38

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