Malicious PDF — malware analysis report

Static analysis result for SHA-256 107d7f4278935f30…

MALICIOUS

PDF

34.6 KB Created: 2021-06-25 07:28:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2f4721522c449386454f6703048121b1 SHA-1: f9ebe8d05b7bf5cdae72600a5d8af70dd523a40c SHA-256: 107d7f4278935f307a23674bcc67d95b1f8636099af9994613b739c405d3c0a6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on 'netcdn.co', disguised as a game hack generator. The ML classifier and specific PDF heuristics strongly indicate malicious intent. While no scripts were extracted, the embedded URLs and the nature of the lure suggest the document is designed to lead the user to a malicious site, likely for further exploitation or phishing.

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/406889139/master-coins-free-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/pokemon-go-free-quest-guide_GM1094591345.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-today_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/play-for-free-robux-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-robux-card-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-scam-games-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-card-codes_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_off00003207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3207 22812 bytes
SHA-256: 76a5820349b6facfd79bdf4db0d1f0629cac28499b06fe5b80f1c04229771b8a
font_01_sfnt_off00006540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 17996 bytes
SHA-256: fa851caa7f63d89d5125b361ad8af841500573ce2358cce74b5d769b3240620f

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