Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49b05f55c72300f…

MALICIOUS

PDF

32.4 KB Created: 2021-07-05 17:23:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cf0be42bb6bdcbc8223c1b4ec3bbc0d9 SHA-1: 35794bc3ba29862331b9b8fb38605d758cf71162 SHA-256: a49b05f55c72300f1cadda9ddaa1d0f3c4700186b7eb0ab4bbbaf6c6a6319e71
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 "free generator" lures, indicating a phishing or scam attempt. The primary link, http://netcdn.tw/app/431946152/roblox-dominus-free-game-hack, is flagged as a malicious redirector. The document body and heuristics suggest the intent is to trick users into visiting these sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/roblox-dominus-free-game-hack In PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/free-obc-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/roblox-lumber-tycoon-2-free-vip-server_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/pubg-uc-180_GM1330123889.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/pls-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stitdarulhijrahmtp.ac.id/repository/best-free-roblox-level-7-full-lua-eecutor_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_off00002a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A99 21420 bytes
SHA-256: 3229bf8265b15e3bc89754e2549c433ef38cf6bc314cbb9008089ed80048351e
font_01_sfnt_off00005954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 19340 bytes
SHA-256: 51aabce8a0fbddbcaac96e5367ec788fa01bdb555ce302519f38501c33e57caf

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