Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02af97287254829…

MALICIOUS

PDF

45.7 KB Created: 2021-06-11 07:08:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 957e6a3f0417d5d347422149e5e0bd5e SHA-1: 7278503c3e1fdac7631736b197af8699363ebf1a SHA-256: f02af972872548293c8a9058e962196a56946c614e90b257057e370c184c9679
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high-risk heuristic firing for a game hack lure that redirects to a credential phishing page impersonating Facebook. The embedded URL, https://netcdn.tw/app/431946152/roblox-decal-id-free-robux-game-hack, is the primary indicator of this phishing attempt. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-decal-id-free-robux-game-hack.
  • 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.tw/app/431946152/roblox-decal-id-free-robux-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/robux-hack-downloa_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/bloxgiving-roblox-high-school-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-client-android_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/mount-everest-roblox-free-rescue-team-gamepass_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-do-u-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/cheat-codes-on-assassin-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-free-2021-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/btools-hacks-roblox-2021-barbaric-gamer-oficial_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/youtube-roblox-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-programm_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-easy-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/youtube-free-robux-codes-urban420_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/hacks-for-unlimeted-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-surf-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-work-at-a-pizza-place-money-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/i-hacked-my-haters-roblox-account_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-diamonds-on-royale-high-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-how-to-get-free-robux-real_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/bloxy-world-roblox-free-robux_GM431946152.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
stream_004_off00004f33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F33 28600 bytes
SHA-256: a04538a1f45864863dbd41990a3c4e96eb7794e169a33c35d0cdaf8f1fb4968a
font_01_sfnt_off00008f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1B 18656 bytes
SHA-256: d81797446d5d07f2cd250aea85d91584b990e76e4e5dd7154ee3bfd6f960b0ad