Malicious PDF — malware analysis report

Static analysis result for SHA-256 406cb63de45ef68a…

MALICIOUS

PDF

34.6 KB Created: 2021-06-29 13:57:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c19603394c4af8bfc3e6cda4bbbcf548 SHA-1: 6a692485c9c3745ab89773fd68704724cffaa0cf SHA-256: 406cb63de45ef68a7ec8efd464c38a35de13709fe8edd53b61dc0b2227ba16b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game hacks or generators. The primary redirector URL is http://netcdn.co/app/431946152/roblox-after-effects-download-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for credential harvesting or malware delivery.

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-after-effects-download-free-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-gratis-2021-sin-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-free-2021-sans-verification-humaine_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/numero-card-robux-50-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-hack-pastebin-fast_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-et-free-faces-on-roblox-easy_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/wurst_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-doungnquest-legandary-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-acocunt_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/notoriety-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-servers-for-roblox-super-power-traing-simulator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-master-spin-and-coin-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
font_00_sfnt_off00002f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F72 22540 bytes
SHA-256: e8e3d9bf51046418e6301db8e7fcce8beccf765987ee9f43fb48aa03329ee51f
font_01_sfnt_off00006195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 19260 bytes
SHA-256: 65156e7685da6508b5ad335ed394110f9edb8cbda685f42d4b72a77faeb88fe6