Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86c6f81ad1bd344…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 23:17:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ac105c73460d29195e3af7697e5b25dd SHA-1: 00b77161524516500fe84dbe29673d241d5c686c SHA-256: c86c6f81ad1bd344ff80b4b53e53ae96ee5c527b65038a651f214c35bd710be8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, masquerading as a "game hack" to entice clicks. The ML classifier also flagged this document with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a common lure for phishing or malware distribution, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/coin-master-hack-online-without-human-verification-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/tiktok-free-followers-and-likes-apk_GM835599320.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/robux-claimer_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-ore-finder-mod_GM479516143.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_003_off00004b28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B28 24544 bytes
SHA-256: 88d1b84aa1b5bba8b83c9314651f90dd8b0f3b8ed27914ec4366f84dde4e9f08
font_01_sfnt_off00008290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8290 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00008f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F16 18688 bytes
SHA-256: 4aaaba9fe6ed58f9b8b1a0433af0e5366d33adc18d760eeacae6851e704aacd8

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