Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81fa99222bc2f3f…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 07:34:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 659d17dc79994530ff3c2c05c47c99a7 SHA-1: 2677b5cf395169c9b287231845538a8405af962a SHA-256: f81fa99222bc2f3f51e93280a2052f15d9f2d9647aa60df46d56a93f2fe7d391
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 0.9980

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/406889139/hack-xp-net-coin-master-game-hack PDF link annotation
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/btools-hack-roblox-download-2021_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/hacker-list-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/project-alpha-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/calamari-roblox-free-acounts_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-pokemon-brick-bronze-hacked-version_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/pokemon-go-free-remote-raid-pass-2021_GM1094591345.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-hack-cheat-buddy_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_off000032d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D4 23332 bytes
SHA-256: 3fab4689f1f9ac7553564b77d4884d4795fc9c335a31c6b00cd878a60dfd8b53
font_01_sfnt_off00006776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 18408 bytes
SHA-256: b3308b8a91f1ba8e8f472f4b736f4bc560ec0a61da9f358da8e6ee933f9aae69

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