Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89c4238b99aa332…

MALICIOUS

PDF

33.3 KB Created: 2021-07-09 14:27:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f93b053e894c06e1e09775927f61c901 SHA-1: 0966b13894e0e5a66ac2b3aa7875c340c248bd80 SHA-256: e89c4238b99aa332d7c3860fb84b6fc733983218c1911661ec4ca917cf47e34f
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and potentially malicious content, masquerading as game hacks and generators. The heuristic firings indicate that the document links to known malicious infrastructure and employs a lure for free game items. While no scripts were explicitly extracted, the nature of the links suggests a workflow designed to lead the user to download or execute further payloads, likely exploiting client-side vulnerabilities.

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/835599320/tiktok-i-feel-kinda-free-song-game-hack In PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
    • http://gornjastubica.hr/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/apk-hack-online-roblox_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-robuxs-on-computer_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/roblox-heaven-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-400-spin-link-today_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_off00002d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D90 22340 bytes
SHA-256: 2999425afaadb63015fba2de7e818383bcf52bd963a85a6a5cc74a6789ccee22
font_01_sfnt_off00005f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6B 18220 bytes
SHA-256: e3938b445ef34a53b2927940887e8dff3f54053d672c67adc6e8b604e95e88d5

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