Malicious PDF — malware analysis report

Static analysis result for SHA-256 53725abf4bcae906…

MALICIOUS

PDF

40.7 KB Created: 2021-05-13 18:54:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c31388fc3b6a36c930e73026ece320ed SHA-1: 044ab7ef15744ce101ba04e61acae162161f8794 SHA-256: 53725abf4bcae906acad1c95107ad8c44028181ab354e6837be1a9c485a4363b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and generators. The primary link, https://netcdn.xyz/app/406889139/coin-master-gift-link-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-gift-link-game-hack In PDF document text
    • http://zercalo.org/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/instant-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/no-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-links-coin-master_GM406889139.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
font_00_sfnt_off0000489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x489A 23640 bytes
SHA-256: 8e28211e519675dc9d272ce07d6db651a48c41e4441931a97140f0184dbe5d80
font_01_sfnt_off00007e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E45 17716 bytes
SHA-256: 8f803537a119e07ded82a73af47a81e82657788fe52602d20bb0bf58e866784a

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