Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37a23202b825f57…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 15:03:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7c39d86ad7660fcd550c238c147c913b SHA-1: dc2b57830a3449ec04ebfeeec96101f2c1847847 SHA-256: e37a23202b825f57fa9e141d13d0396e36c08efe2fd48f09c4bf6e5a7f96e041
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The heuristic PDF_GAME_HACK_REDIRECT_LURE strongly indicates a social engineering tactic to trick users into visiting potentially harmful sites. While no scripts were extracted, the embedded URLs and the nature of the lures suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-hack-mcpe-master-coins-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/app-hack-online-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-builders-club-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/game-coin-master-hack_GM406889139.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_off00002f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F41 22456 bytes
SHA-256: 24a9f027e8e94bc6575cbcbd245a73b16111a279e6ba4f4351c40f55e76c262e
font_01_sfnt_off0000616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 18344 bytes
SHA-256: 0d31b036bdcd96e189ca4508b1245f70917a7d6f0a541cc48812d863710d68c6

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