Malicious PDF — malware analysis report

Static analysis result for SHA-256 d457384d9a4c1a81…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 00:47:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 01b08fc44b9b81c6a73f768d673d113a SHA-1: e6cbb632b8c26265a13fa6fff711a63e65132f9a SHA-256: d457384d9a4c1a81a010153d9e5064d15e877a08171660d6cd1840d2fb31b4e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link disguised as a "free Robux generator" lure, which is identified as a malicious redirector. This redirector likely leads to further malicious content or downloads. The presence of multiple links to similar scam-like domains reinforces the malicious intent. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-generator-without-any-verifacations-or-downloads-to-chrome-game-hack In PDF document text
    • http://elearnfactory.com/images/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/mega-nz-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/robux-come_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/free-minecraft-skins_GM479516143.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_off00005192.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5192 24140 bytes
SHA-256: 93cc1d3621f0cf5bd03d2eaf6520c37aaec0092ac7b91de709c8ff2e4209a097
font_01_sfnt_off00008887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8887 19984 bytes
SHA-256: f6e1f269dedb6c2951ef1d5992609e814e29dd511f7a283ba99fc19afb88d4e4

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