Malicious PDF — malware analysis report

Static analysis result for SHA-256 3218e30550b60519…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 05:57:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d973ae80cc0adb29b2d8087e7de8285 SHA-1: 0bc90fd96a18dabb8b8a6f00d9f671a6bf0fa36d SHA-256: 3218e30550b60519d3deb37937c991134529214e92d67e91fba204ec28cf920b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of 'Free Robux Apps That Work' to trick users into clicking malicious links. The document contains multiple embedded URLs, including one pointing to a known malicious redirector and another to an IP address, both of which lead to further PDF files or potentially malware. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-apps-that-work-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-apps-that-work-game-hack In PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/hack-de-roblox-dragon-ball-rage_GM431946152.pdfPDF link annotation
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/best-free-stuff-in-the-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-jurassic-world-headphones-roblox_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/100-robux_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/roblox-generator_GM431946152.pdfIn PDF document text
    • http://103.30.145.97/__statics/gudangsoal/files/what-is-coin-master-app_GM406889139.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_off000031c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C9 22168 bytes
SHA-256: 059bda3082e554858961647994ff08e1e2082414a3aa9708e2eb42a02de76577
font_01_sfnt_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 19528 bytes
SHA-256: 3ce59685ce564c47d51d5d1714b73889d1d344349ceb90d9e3a1730e11095f67

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