Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48c525cdf563c1c…

MALICIOUS

PDF

41.7 KB Created: 2021-05-19 05:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 73749b845db9fc004f7a5d8c92079b16 SHA-1: ae47aa2cf08360e23f7e9ed49a531d065567f3b4 SHA-256: d48c525cdf563c1c8381497bfe4d590879f67202dd8d94a118d430807c2aa2a0
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious links, specifically promoting "game hacks" and "generators." The embedded URL https://netcdn.xyz/app/406889139/hack-para-coin-master-singapore-game-hack is identified as a malicious redirector. While no scripts were directly extracted, the document's structure and heuristics suggest it's designed to exploit user interaction for payload delivery, likely via JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/hack-para-coin-master-singapore-game-hack In PDF document text
    • http://arpinoturismo.it/images/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/open-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/minecraft-hack-download_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_003_off000048f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F4 24300 bytes
SHA-256: 495dd78c22a9af6bd7259c224b6e69342a300c5110e750864ccc254f0a0e5fd6
font_01_sfnt_off0000805f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805F 18332 bytes
SHA-256: f4cc29573db357544154724085d5d3303098b5cd5cdfb23e2fd2f731e3bbede2

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