Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad242134df08162…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 12:47:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ba727ee1b48842004ebaa9a7ed68ed60 SHA-1: f76a7d949439a2c644435e63a303c69348b7bf1c SHA-256: 4ad242134df08162390690a3b4abe9dc5189812912be5e7286fa42736985b26d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains and game hack lures, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a download button lure suggest that the primary goal is to redirect the user to a malicious site. The document body and embedded URLs strongly suggest a lure related to game cheats and in-game currency.

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.tw/app/406889139/coin-master-daily-free-link-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/synapse-hack-roblox-murder-mystey_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/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-skin-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-gang_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-offline_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-account-with-rpbux-password_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/dancing-sim-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/no-human-verification_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
font_00_sfnt_off00002f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3B 22680 bytes
SHA-256: 9b86ab0f69ef593533c2193007569d592b0f52f52bb4a9c0bc800e620e736465
font_01_sfnt_off00006203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6203 18588 bytes
SHA-256: 602990f58edd0fffaccb1593f10b6a26f20777d4b3942483c7e8a81716f82fb0

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