Malicious PDF — malware analysis report

Static analysis result for SHA-256 8157fc2bb4b3ddd8…

MALICIOUS

PDF

45.2 KB Created: 2021-04-30 03:55:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 62220815e4ca81dbb4d4f0415fd3b3da SHA-1: 5ac4206c22f8393d130475e5c077a44decbf4ad4 SHA-256: 8157fc2bb4b3ddd896f319143762d1f16e50a4f6f2146efd3cab0baa1cbdb6e6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.xyz/app/431946152/free-credit-card-numbers-for-roblox-game-hack PDF link annotation
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-hack-roblox-tycoons-with-cheat-engine-64.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/pastebin-com-free-robux-2021.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-robux-secret-hack.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/cool-cheat-engine-hacks-roblox.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-free-hats-robloxs.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-how-to-get-free-robux-2021.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/cheat-doodle-robux.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-counter-blox-hacks-2021-download.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-shirts-roblox-2021.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-model-butterflies-roblox.pdfIn PDF document text
    • https://freerobux.cyouIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004499.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4499 26016 bytes
SHA-256: 3e7bf93e8e6f0e96fb242a05a95c204111dce72979821611267edf9eb60e912e
font_01_sfnt_off0000802a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802A 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD2 18972 bytes
SHA-256: 823aa7521a139fe781aff32575b7051ac5508464c805e19915afcc330dc99722

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