Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83ba1c611fc0798…

MALICIOUS

PDF

35.1 KB Created: 2021-07-02 04:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 13215d79a5a19dc0ec32a33d6b1f24dd SHA-1: 0facc1a5d6a7009e28c67e4f95481e9fe4104b77 SHA-256: a83ba1c611fc07983a3068bb3fd1a96c011894c04d55eef8c126a06bae356e92
200 Risk Score

Malware Insights

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

The PDF contains links to a known malicious redirector, masquerading as a 'free generator' or 'game hack' to lure users. The document body and embedded URLs reinforce this lure, suggesting an attempt to trick users into visiting malicious sites. The presence of a password-protected archive lure indicates an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/free-robux-no-personal-information-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-account-and-password-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-ajuto-clicker-is-it-a-cheat_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/cheat-codes-on-assassin-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-vampire-hunters-2-cheats_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/omg-this-worked-how-to-get-1-million-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/22-500-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-for-ipad-free_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_off00003114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3114 22404 bytes
SHA-256: 4b6da0d7929de7e857dc702afb6763bbdde5934757c396f3e41a04557c970637
font_01_sfnt_off00006331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 19428 bytes
SHA-256: fc333fe53d69cad64228f15475100e0e65d74cb84700c102ba31c75d2f62f4ac

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