Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe0bca97db0e8e7…

MALICIOUS

PDF

46.3 KB Created: 2021-06-09 11:04:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8d8c5b45390062a07552492df1041fcd SHA-1: 66f07875c46c62646f9e36ceb2b6291fb09c503d SHA-256: cfe0bca97db0e8e76fc1c4412891f0b4ee2f8841835abe94c2fbca257738da25
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising free in-game currency and hacks. The primary lure URL is https://netcdn.tw/app/431946152/free-robux-site-surveys-game-hack, which is associated with a high number of redirector links. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free items to lead them to potentially malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-robux-site-surveys-game-hack In PDF document text
    • http://elearnfactory.com/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/hack-for-texting-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/tiktok-free-views-hack_GM835599320.pdfIn PDF document text
    • http://elearnfactory.com/images/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/wahoo-gaming-co-free-robux_GM431946152.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_off00005498.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5498 26168 bytes
SHA-256: b37d982482689817319c8b482f92054c089ec4342bf5b951ea6d086f402521e1
font_01_sfnt_off000091dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 18532 bytes
SHA-256: aaf6355b119d7c6a332314a4aeffe4639fb2a2c96be5f54212dedd097cf9c030

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