Malicious PDF — malware analysis report

Static analysis result for SHA-256 395c55bb316a5ea3…

MALICIOUS

PDF

39.9 KB Created: 2021-05-20 19:57:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5ad03624537b2c568268fd7c3679cf54 SHA-1: 0fae030f79b2e9e400476a99f3fecad9343c2377 SHA-256: 395c55bb316a5ea3bed24b4aa3eab5963e429cbcbaea7203d5917010715ec3fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically disguised as game hacks for popular games like Roblox and Coin Master. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to phishing sites or further malware downloads, aiming to exploit user interest in game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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 https://netcdn.xyz/app/431946152/how-to-hack-roblox-game-hack In PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000342c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x342C 24680 bytes
SHA-256: 24312ef21fa6079e5ef36b1cf12b35bfadf7591c0992bf7a76c3bdcfdd8fde68
font_01_sfnt_off00006cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off000079ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 18344 bytes
SHA-256: 73440050ee62d9c8dc97d7cf0d13859b5ca63a66159f36279ab18a86d0bf293f

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