Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a3d0e779a40e26…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 21:32:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da91aa323f21a65ef6551ed6bde984a3 SHA-1: 89e6e6a843b452342954d2d95617798b9fcc89fd SHA-256: 02a3d0e779a40e268e66f626aec2ae4157b317ef5325f30c0d4bade85c331da6
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded links and a call-to-action phrase, directing users to a known malicious redirector infrastructure. The primary lure is for 'free Robux' or game hacks, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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/431946152/free-800-robux-game-hack In PDF document text
    • https://mbbs.hr/files/hacks-for-mm2-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/pokemon-go-free-joystick-mod-ios_GM1094591345.pdfIn PDF document text
    • https://mbbs.hr/files/arrest-script-roblox-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://mbbs.hr/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-clothing-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-studio-free-games_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/is-casdg9-a-roblox-hacker_GM431946152.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_off00002de2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DE2 23064 bytes
SHA-256: dbed015bc7b7472fb3125e6c3f4a39b3937e36b931fa6e600b5873e347957db0
font_01_sfnt_off0000619d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 19100 bytes
SHA-256: 0ebfa7702a782f6f4faf41f8567968345b55cc7a7d3e2a6dc37d1edcf849371e

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