Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc7867757ceaf1f…

MALICIOUS

PDF

50.3 KB Created: 2021-06-03 06:11:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c3ae2da236f25092059769ab4377f13a SHA-1: 33b24e312753121253cdc4c087e8e1a417dd5519 SHA-256: 4fc7867757ceaf1fd18443662ad017fc76efab836e9f04eca89dd67e37557ecc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though partially corrupted, also contains this URL and references 'Coin Master Free Spins App Android', reinforcing the lure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the primary attack pattern involves redirecting the user to a malicious site via an embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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.online/app/406889139/coin-master-free-spins-app-android-game-hack In PDF document text
    • http://ghi.dk/billeder/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://ghi.dk/billeder/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://ghi.dk/billeder/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://ghi.dk/billeder/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000511f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x511F 25172 bytes
SHA-256: 619b0fbb58e3de8c24c8c6154ef57f66d49592729579e0d2ff79ae9654ea2fae
font_01_sfnt_off00008ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE6 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off00009887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9887 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA277 18060 bytes
SHA-256: 7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7

Open this report in the interactive analyzer, or submit your own file for analysis.