Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48f90a6de544af8…

MALICIOUS

PDF

33.8 KB Created: 2021-07-07 11:12:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ccb81d7801185e312cb221eb27152ed6 SHA-1: 87415aec5938665998aad5a13b8b083b7f4ddbea SHA-256: b48f90a6de544af815cfeeed621061db8a551d11618a79aa9e55b6af2c1bd280
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including a high-priority link to 'netcdn.tw' which is flagged as a game hack redirector. The document body and extracted URLs suggest a lure for free game currency or hacks, a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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-wins-in-anarchy-roblox-game-hack PDF link annotation
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/claim-robux-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/rob-hacker-robux-generator_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/roblox-thinknoodles-free-fall_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/best-roblox-hacks-site_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkotabatu.sch.id/__statics/gudangsoal/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD8 21296 bytes
SHA-256: 5a6298b93c7754de186da5b3fa7fba67e6acaa2f5b1de25f19cd2a66aabfeca8
font_01_sfnt_off00005e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E58 19316 bytes
SHA-256: 3a9ca0587c8c1cb7068b0e3fbe72ddf8c59766eb742a09e4b065f3db75118a8d

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