Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d82d672d1f1553…

MALICIOUS

PDF

46.9 KB Created: 2021-06-04 02:58:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 882acf35689faf691cf9b08921c76aad SHA-1: 0a59df5b6e13443d75a1437793af32ce8afcfb95 SHA-256: 88d82d672d1f1553058ed474c83842cd02a2327694b09ea4d06d8e370eb71411
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_GAME_HACK_REDIRECT_LURE' heuristics. The document body and embedded links promote 'free Robux' and 'game hacks', a common lure for phishing and malware distribution. No scripts were extracted, but the presence of multiple malicious redirector links suggests an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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.online/app/431946152/free-robux-roblox-promo-codes-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/mcpe-free-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
font_00_sfnt_off000053eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53EB 28408 bytes
SHA-256: 641fab615033b619fe80aa775f2e083cba9fd20beb8855b923ac9509b5eb121f
font_01_sfnt_off000093dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93DD 18676 bytes
SHA-256: 9297a3cb5fba7ca587652f513aa1222127deb04773b45a9c0f6482a9c793d56f

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