Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efb540e81571daf…

MALICIOUS

PDF

48.2 KB Created: 2021-05-11 23:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d04358dde3c76d8b89323a44a72a4c94 SHA-1: 5fc34a65fa58c89d156f728ad12da3a43ccc1048 SHA-256: 8efb540e81571daff09dbc7c6e37aab2ede26f8d8fb13174b9ddb70d636c4c86
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/free-coin-master-glitches-game-hack', are identified as malicious redirectors. The document's structure and content strongly suggest it is part of a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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.xyz/app/406889139/free-coin-master-glitches-game-hack In PDF document text
    • http://rexingen.info/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://rexingen.info/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://rexingen.info/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://rexingen.info/images/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4B 24668 bytes
SHA-256: 113a06c7ac9ad4f9441c756284b2b550f45a47932bb3b692c4a37071e1f385f9
font_01_sfnt_off0000832b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832B 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off000090cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90CC 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABC 17952 bytes
SHA-256: 46024ec7988d8a29f9899108edac54a6ffad934125eaec0bee682c20bd570941

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