Malicious PDF — malware analysis report

Static analysis result for SHA-256 61027c3b0305e24e…

MALICIOUS

PDF

49.0 KB Created: 2021-06-11 08:24:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b63d4f1c10ff76b2dc7232bd4a3c213b SHA-1: 612da285ff517905f4c5ed78fcbeccd79d08bb3f SHA-256: 61027c3b0305e24e6aa2732fb7ae569808ac1605e5fd2a82f6c2c0984f8dbcb8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a 'game hack' or 'free promo codes' lure. The document body and heuristics indicate a social engineering tactic to entice users to click these links. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious redirects or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-promo-codes-roblox-august-2021-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/tiroblox-cheats-for-robux-and-tix-robloxcheatsnet-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-hack-god-mode-phantom-forces_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-freebies-hack_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/pubg-uc-voucher-redeem_GM1330123889.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/moon-active_GM406889139.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
font_00_sfnt_off000051f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F2 26404 bytes
SHA-256: c472e699d39270506ad1a2ec63fa4d7ef9c082e8abd9db093b72e52b5d5fe2a9
font_01_sfnt_off00008c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off0000992b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x992B 19472 bytes
SHA-256: 37c9418897bd0ae130255e3c6de49e04a429c36add3f6d226606d93121c44b4b

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