Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b4b42a76f77be0…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 18:49:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5e4b883ae292a7f7d61c8bc597a10530 SHA-1: 15e483a87450367e24979febf4fae2751607aef4 SHA-256: 44b4b42a76f77be0400dd8512cfaf0d99c97f95a97f6d8ab45f23ee8f6c186dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/431946152/roblox-hack-site-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/431946152/roblox-hack-site-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/hacker-tool-for-roblox-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-speed-hack-dll_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-groups-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/rbxoffers-com-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/speed-hack-code-for-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-accounts-2021-october_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/secret-robux-hack-revealed-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-com-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/sbh-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/fortnite-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-pf-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/blogspot-free-spins-coin-master_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_off00003066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3066 22140 bytes
SHA-256: 8ad1c45f6a3c091b257c8feaa08baa807187c878bcf43d71e0ce82dd254bd998
font_01_sfnt_off0000614e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614E 18880 bytes
SHA-256: 6798a5860b29af3a79a68d7c52601d34cb5f107bdf36f63a1b46f66fdb0dc288

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