Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b481e0cd91724…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 20:04:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0d48ce71d282720e215ada005a001b2e SHA-1: 2ed4ac43e41bd985d6bec0413fc8fead4617051b SHA-256: f00b481e0cd917244291cec1acb42167706e1ce461f783d0e3e733f1445b8903
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a redirector link to a 'free generator / game hack' lure. The document body and numerous extracted URLs reinforce this theme, pointing to sites offering game hacks and free currency. The ML classifier also flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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/406889139/coin-master-firebird-card-free-game-hack In PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-roblox-2021-august_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-2all-site-hack_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/earn-roblox-free_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/robux-hack-without-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://na.itk.ac.id/asset/backend/upload/ckeditor/files/free-spin-coin-master-hack-2021_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_off00003251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3251 22676 bytes
SHA-256: 8b549ff31ce71620cf95888836fc7dc5339a147409a982b007ff10a419597751
font_01_sfnt_off000064fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 18328 bytes
SHA-256: 2cf099823a9c0df98c55330e895f61e0661279471d18d6960b52a287134192b8

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