Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7b73188ead8b42…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 08:59:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8fb7a953dbea9536b159d0f5ec63d855 SHA-1: 62ce9364d2c086c98ba24415aa097fa5e74263c3 SHA-256: 1c7b73188ead8b42dad40b5ac6a3408cf98c5c63135cfba5a900e4d189bc8139
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to host further malicious content or phishing pages.

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.tw/app/431946152/free-robux-mod-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/cuentas-gratis-de-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/tiktok-get-free-followers_GM835599320.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-r-cheats-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/redeem-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-how-to-get-free-items-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-cat-ears-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-hack-youtube-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-para-roblox-mathdrive-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/shirt-roblox-2021-free-dowload-transparent_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/is-it-still-possible-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/idsk-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-dantdm-shirt-free_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_off00003017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3017 21888 bytes
SHA-256: 84730ef428754a5cd2f34eeadb3b01506a3f09c229446beb4e08c43698c56bce
font_01_sfnt_off00006015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 19088 bytes
SHA-256: 3c56140fee9dfb5ded46378f21a8de948775312b2d7b3282d1f8cc46bd34fe6a

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