Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e81f779fd3e70b…

MALICIOUS

PDF

52.1 KB Created: 2021-06-10 23:11:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 732beedc83db212383d6c36b0b8fc861 SHA-1: 7f795ddc745f2e153a2b9be450a98ee3f28d0ca4 SHA-256: f9e81f779fd3e70b1cbcd968d89bcff67e58518b3cc63f289ca8110bd5911735
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing users to a suspicious URL. This indicates a social engineering tactic to lead users to a potentially malicious website. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://netcdn.tw/app/431946152/earn-free-robux-no-survey-game-hack PDF link annotation
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/pokemon-go-free-leafeon_GM1094591345.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-hack-redline-v3-0-download_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-play-for-free-no-sign-up_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-cheats-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/pokemon-go-free-friend-codes_GM1094591345.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-btools-script-free_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-free-model-rules_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C5 25836 bytes
SHA-256: 5dae2bb872b00002430ef111435c25dd411a105ac07b7da5758fe54be16dbb3c
font_01_sfnt_off00008dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC4 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000097aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_03_sfnt_off0000a7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E8 18536 bytes
SHA-256: 9a171c1d0459cd1c8a329e6ddfb89d4e9c4899464b604da06da3dcd7106a5cd5

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