Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a60496aa2eac9bf…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 10:55:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 448263d44b78fabbf10ae60dac2b570c SHA-1: 4371abbc7f459782777424c9b282b2a37843c654 SHA-256: 1a60496aa2eac9bf585e1e18706be6818f38d2d8e35ff9215bd0962750851a42
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game hacks. The primary link, http://netcdn.tw/app/431946152/how-to-change-your-username-on-roblox-for-free-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

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/how-to-change-your-username-on-roblox-for-free-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/ez-points-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/donating-free-robux-live_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/pokemon-go-free-2021_GM1094591345.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts-2021-that-work_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/tiktok-free-followers-apk_GM835599320.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_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_off000030f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F8 22720 bytes
SHA-256: ad3f61b1677fd8437d94911ae451a74d7dc9deb2aa716d22b6e17b6d0cf8edb4
font_01_sfnt_off000063e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 19540 bytes
SHA-256: 13561b44f61144c121be84d59be9fad9902bdfea6fe0fd721d4b8ce19c369a19

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