Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7995c8287706a2…

MALICIOUS

PDF

34.1 KB Created: 2021-06-26 11:34:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b46dae0ca29f5d46db9429dc6e315a3 SHA-1: 0f2e444043dc8a158818e8a229162ef9eb8b643f SHA-256: 7b7995c8287706a20838075beef59d3cc1ea907852bdf2735d5de2fdb1fe21d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary heuristic firings indicate a malicious redirector and a lure for game hacks. The document body reinforces this by containing the same lure text and URLs, suggesting the intent is to drive users to malicious sites that likely host further malware or scams.

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-get-free-robux-on-a-website-game-hack In PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-vehicle-simulator-free-gamepass_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/hack-struicid-stop-start-roblox_GM431946152.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/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-on-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-bee-swarm-simulator-super-mega-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-app_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_off00002fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEF 21656 bytes
SHA-256: e2970ff17d115d2a544f54c568a044b2b70d18972eb70a6a209a38eee261f1bc
font_01_sfnt_off00005f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3D 19304 bytes
SHA-256: 957b12cf12ae9be647c1a3e76a0a38c6707de1040f13cc35f1ff05de03748461

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