Malicious PDF — malware analysis report

Static analysis result for SHA-256 723170c734114a66…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 09:52:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1ecf173d772e40879bf949842bd70a55 SHA-1: a66527e77ba22d7942f9db8c666bb839c6b7ce83 SHA-256: 723170c734114a66d10822bdef64e0eec2e1b0605824b2ed4225d284379f7043
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into visiting malicious URLs. The document contains multiple links to redirector infrastructure and IP addresses hosting further malicious PDF files. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs points to a phishing or malware distribution attempt.

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-generator-no-survey-game-hack In PDF document text
    • http://118.98.227.172/opac/repository/roblox-survey-for-robux_GM431946152.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/hack-all-computers-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/youtube-free-robux-legit_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-roblox-animations-for-free_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/cheat-engine-roblox-knifesim_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/tiktok-accounts-for-free_GM835599320.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/best-exploit-roblox-free_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/game-on-roblox-free-items-on-the-catalog-no-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-indieun_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/hack-coin-master-apk-358_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_off00003082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3082 22716 bytes
SHA-256: 8819d6be3ac438681cf7efaca7a90ce9ae948b786457d4a55eead13d2d92b885
font_01_sfnt_off00006310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6310 19112 bytes
SHA-256: 33dfcb2d47e73eef9736d676cbbc8a7ec86e5e18ee4675d0e02e08c00d2a765b

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