Malicious PDF — malware analysis report

Static analysis result for SHA-256 77107cce5cdc04e4…

MALICIOUS

PDF

32.8 KB Created: 2021-07-22 00:58:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3cbf689d81b76d882df129e9ee7eec2d SHA-1: 0938d5bb3074632e08841105af50c8645ca2f8d0 SHA-256: 77107cce5cdc04e4d57f35b4738a58372be2a55ccbc12d08b51668d18ff40790
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action button that direct users to a malicious redirector URL, masquerading as a free game hack or generator. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the lure of free game content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/479516143/minecraft-download-free-download-game-hack In PDF document text
    • https://infocorrosion.com/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://infocorrosion.com/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://infocorrosion.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://infocorrosion.com/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://infocorrosion.com/images/minecraft-on-computer-free_GM479516143.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_off00002d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4F 22104 bytes
SHA-256: 602d605beee4ec7f4023cfbba1b442a6fdebd3b3c656e35b30db5ace129ff28b
font_01_sfnt_off00005e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0A 18292 bytes
SHA-256: bcf6477408162be3b167f843e68a68979a000ee483b53557047313ee62fe1046