Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d8e26e985712b2…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 14:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7e4312ef6fa13ad31b2b29546bcba572 SHA-1: 33df90db3976c324e02206a0cc09da36da2dc5c9 SHA-256: 83d8e26e985712b2c33591ed11ea298323f1a74bae05e2e87dc147606ca41e7a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains URLs that are consistent with this lure. The presence of a 'password-protected archive' heuristic suggests a multi-stage attack where the actual payload is hidden.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/roblox-font-free-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-no-password_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-more-spins-on-coin-master-for-free_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
stream_004_off0000502e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502E 24116 bytes
SHA-256: 6eae5145bf29058a660ff038f759c29347a1ec55f94f83e260de392e5c209472
font_01_sfnt_off00008736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8736 18052 bytes
SHA-256: fc18e09b38e7f37cf7e275b91981e3530b795bdeaada945aa3ce95e8818dbc1b

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