Malicious PDF — malware analysis report

Static analysis result for SHA-256 de257a85c2996761…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 17:22:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d346ed3b4fc884004c635afb6cba084c SHA-1: 10c4baba2cdf1d113aa3abc335bf76ba9bf20504 SHA-256: de257a85c29967616479dbcfe3c61c9b59ac7db7df48b4048e8f047009e93a4b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and 'game hacks', directing users to a suspicious URL. This is a common social engineering tactic to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/claim-free-robux-game-hack PDF link annotation
    • https://perpustakaan.stifar.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-groups-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/hack-voler-sur-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/eran-robux-free-robux-vrobux-com_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-any-gamepass-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-profanity-cheat_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-how-to-get-robux-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-terminated-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-heroes-online-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/redeem-robux-card-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/get-1b-robux-free-no-hacks-roblox_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
font_00_sfnt_off00002dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD9 22144 bytes
SHA-256: beb3d9c578d7e15ca7dce1684fdee1fa35856940d13eaead729135c2ccc8e8b3
font_01_sfnt_off00005efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 19168 bytes
SHA-256: dfc8721fbf6b4988d00971a58b16fe325011594e1ee6efadf5a4fdcf2df05fca

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