Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b9fbaf61b2627b…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 01:45:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5dbe78da37509f00494d69081c0bf3df SHA-1: b105e4b6a3a98eb3e4bcb508f0fc74c94c4baee6 SHA-256: 35b9fbaf61b2627b64484c95adf8f53d091e340c391aaccc92db656f8ba5142b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary link pointing to a known malicious redirector. The document body and heuristics indicate a lure for game-related hacks, specifically for Roblox, which is a common theme for phishing and malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent, likely leading to further malware downloads or credential harvesting.

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.co/app/431946152/roblox-royale-high-school-diamond-hack-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-account-with-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-not-fake-no-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pokemon-go-free-walk-android_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-escape-room-free-access-code_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_off00002eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAB 22264 bytes
SHA-256: a2adafcdce9d2a98a85fd06b176277f610904265316d36dceb0cd702afec728a
font_01_sfnt_off00005fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 19724 bytes
SHA-256: b7b834e323fec9c262f9d1ff9840f661aaf02793ccc43dd0ed6e8abdc0f07596

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