Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2099d94208fab7d…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 19:50:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ce9440c3a0c48768eda445bd7ccff989 SHA-1: 6108d577fbb3b6229105c517ce6601332688f8f7 SHA-256: a2099d94208fab7de638dcf051f9bb64d1d16a4a273ff7a16da784ff2359987d
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and websites offering game hacks and free accounts, indicating a lure-based attack. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a call-to-action button reinforces the malicious intent. The primary goal appears to be directing users to potentially harmful sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/lucky-patcher-coin-master-hack-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-proxy_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-free-script_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-password-needed-or-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-games-download-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_002_off00002d3e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D3E 22304 bytes
SHA-256: 1061c43602f1d02649cd49f203fac02e8e3ff87cc62e991f2eb61b15c44e59d1
font_01_sfnt_off00005eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 18644 bytes
SHA-256: 62d67ccd9da712bc6337db9d68f01eeacea3f740b309a08d4949e1f324755b54

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