Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3a139d49dc48f6…

MALICIOUS

PDF

36.2 KB Created: 2021-07-01 08:51:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5095e30524c6de1fccd7d5929d00022b SHA-1: 6541c6bed3d5576f9c5e9c7a80875ce493f324d9 SHA-256: 1f3a139d49dc48f66845e2b25e11518e3d8bcf05a26f29c91778b6b58cfce757
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free generators. The primary lure URL is http://netcdn.co/app/431946152/how-to-hack-for-2021-robux-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into visiting malicious sites, likely for malware distribution or credential harvesting.

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/431946152/how-to-hack-for-2021-robux-game-hack In PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/game-action-aventure-magic-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-into-a-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-vehivle-simulator-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/mega-marble-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-hack-no-survey-and-no-user-id_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-email_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_off00003517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3517 22412 bytes
SHA-256: 1e5ea619a47e595f8d119d2990d6ca0c95d2c936d8244ff3b3c52e0cfd2c1009
font_01_sfnt_off0000672e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672E 19452 bytes
SHA-256: 9cc895ba4d34c7a22a16f75581ae493cc5e9abc977e4f609cbcdd03e29c867d3

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