Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81cd245f1504ab7…

MALICIOUS

PDF

49.9 KB Created: 2021-06-09 03:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 322130cdb1888f36cb6c631a53938808 SHA-1: abd4d962e5d1728d4a859015a781ef34bbc28b5d SHA-256: f81cd245f1504ab72691b45ce487cf4b75660325b02fd983c8cd36fc400912f8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/hack-robux-2021-no-human-verification-game-hack PDF link annotation
    • http://perpus.iainkediri.ac.id/pasca/repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/pokemon-go-free-30-ultra-balls_GM1094591345.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005461.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5461 27880 bytes
SHA-256: 81d649b5ef629e2920178cd2a7f1d44c5b3c1e78d7666ce5e0eb9b87b43b8031
font_01_sfnt_off00009366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9366 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D17 19268 bytes
SHA-256: e327f1f0f3af34705d20a3cf4a310a452b0533f72f156a321429098abeb62509

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