Malicious PDF — malware analysis report

Static analysis result for SHA-256 89253e49ab218e9f…

MALICIOUS

PDF

34.0 KB Created: 2021-07-19 12:52:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0d3767b6f0a03d36c42ce1819d8255a3 SHA-1: d09d02a2938b340559f37d8a4cad22b480e94506 SHA-256: 89253e49ab218e9f1d67b84e2cfe58d93bd5f1c6bebfef8bb03c96ff5ce31c1d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game hacks and likes. The primary malicious URL identified is http://netcdn.tw/app/835599320/free-tiktok-likes-no-human-verification-or-download-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/835599320/free-tiktok-likes-no-human-verification-or-download-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.tiktok.com/fypIn 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_off00002f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F37 22520 bytes
SHA-256: 0c2efb3daad1a9467ab24483ddcbcf0c13c3f38d2f503a243ccd18c6af77503e
font_01_sfnt_off00006180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 18796 bytes
SHA-256: 3d40c2c610592f010e994df70d6dca89d92a7e9c48723e1cae8d3a563b12c301

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