Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb53ebc25db3a897…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 13:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85c07e58fa73e8a2ec2c04f33ee1ce53 SHA-1: 99129c3c00430144c5b44cec5fb115562be77c63 SHA-256: eb53ebc25db3a897b7255cf8cfd5755ef31777a4acfe289cff9a00fe5d77f909
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically advertising 'game hacks' and 'free Robux'. The ML classifier strongly indicates maliciousness, and the document body, though garbled, contains URLs consistent with a phishing or scam lure. The primary attack pattern involves tricking the user into visiting a malicious URL, likely leading to further malware download 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.tw/app/479516143/mc-update-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/robux-now-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/online-roblox-free-games_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-no-hack-easy_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-para-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/slurp-roblox-hack-key_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/admin-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-arsenal-hack_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_off000030e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E4 23100 bytes
SHA-256: 3b2459fec6c936ad86b647ce49ad157a786657af14c582d65cb252bfc805ad0f
font_01_sfnt_off0000642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 18272 bytes
SHA-256: 82dc0b43539ef2d7bbb3eb626da65d3f7def0b72e0a32f2638731d13eaa39649

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