Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91dc6a6ee7feacd…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 18:45:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f2d1bc37dd030fe038558e916beee6f SHA-1: a78bc9b1c23d97e14a61dce7a1f04b39ea02e495 SHA-256: a91dc6a6ee7feacd23b8210509b87f176a5641f90dd99bd6a0e582bc6cffa1e7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a 'free generator / game hack' lure, indicating a phishing or scam attempt. The document body and extracted URLs strongly suggest the intent is to trick users into visiting malicious sites, likely for credential harvesting or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious redirector.

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/431946152/robux-codes-generator-no-human-verification-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-robux-bc-accounts-codes-more_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-spin-and-win-coin-master_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_off000031d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D9 22120 bytes
SHA-256: 1e6eac45e473cf5d6905b8083a8ae5af18fae9eefcd362a699aab27d60260497
font_01_sfnt_off000062be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 19344 bytes
SHA-256: d97a6452949562d75530f92f626f1cbdf04310b8890864793c0fa9c83aa1390d

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