Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86fdac87ef1512e…

MALICIOUS

PDF

44.0 KB Created: 2021-06-04 03:15:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d2b385ab7f824356864a70f9f8904725 SHA-1: 6e269bad8661e3dd58dbafdff089199c81378d72 SHA-256: a86fdac87ef1512ebdaeea5684a046771b816b932b9c8cc7bb5a230b7c2cecd1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising "free generators" and "game hacks" for popular games. The ML classifier strongly flagged this PDF as malicious. The embedded links likely lead to further malicious content or phishing pages, aiming to trick users into compromising their accounts or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/is-coin-master-free-game-hack In PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/body-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/tiktok-free-zone_GM835599320.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-minecraft-realm-codes_GM479516143.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
stream_004_off000053d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D8 24252 bytes
SHA-256: 60f99443dfc86d4aa9ac1416f5879478c83ae80d97c279c33f60ed244ce2f45a
font_01_sfnt_off00008b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 17712 bytes
SHA-256: 22c3a497f096f7cfd0c016656a28f48d4ef3a3357dd0b23db76023e58fde53c0

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