Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa1dd175d5a8cd7…

MALICIOUS

PDF

47.3 KB Created: 2021-06-09 05:32:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 932446265b53b5537165a717da7b886c SHA-1: 77f01a0ff6827742966754194de5b830c0444ee3 SHA-256: efa1dd175d5a8cd7ff1cd38bc3b119e2bbcc34e9dc1a57b86629c480040677c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL, which is associated with malicious activity. The document body and heuristics indicate a lure for free game-related items, likely to trick users into visiting the malicious link. No scripts were extracted, but the presence of embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/how-to-get-free-robux-gift-cards-2021-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/como-hackear-roblox-con-lucky-patcher_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-with-roblox-redeem-card_GM431946152.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_off00005080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5080 24616 bytes
SHA-256: 989152c4d3e04b4f42d0a5f5ff9334eb9b6c709dd50af67ce98901ece0905d83
font_01_sfnt_off0000892f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892F 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000092f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F0 19204 bytes
SHA-256: 546a22bff208586e18d2bfd2acbe46833c173e45195e38c580510193f82be88e

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