Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a9dd810a721b6d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 18:24:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5c3040d17663b15f2532cf32acc58910 SHA-1: db4bb404da083d3264442ec440174855390af12a SHA-256: b1a9dd810a721b6d53554dee91f056d60eef1dcb2964f8aaac53ad4fe61faddd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including a prominent one to 'http://netcdn.tw/app/431946152/free-robux-only-username-game-hack', which is flagged as a lure for game hacks. The ML classifier also strongly indicated maliciousness. The document body and heuristics suggest a social engineering tactic to trick users into visiting a potentially malicious site, 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 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/free-robux-only-username-game-hack PDF link annotation
    • http://www.perpustakaan.unda.ac.id//repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-money-on-pet-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-best-exploit-cheat-ever_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/base-wars-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-pokeballs-in-pokemon-go-2021_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-new-shoot-though-walls-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-roblox-juillet-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-change-name-for-free-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_off00002fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC9 22388 bytes
SHA-256: e379caf20cb9ea22b1b0b394a0b03806c720378b17a29fa0ac6575adc1a6d9bf
font_01_sfnt_off000061be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 19228 bytes
SHA-256: 6dddefc2d48c7f37f50c1a6b710d30cd99cee34b64e744400aeeb56817a3b712

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