Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a7ac7f910c0c17…

MALICIOUS

PDF

32.8 KB Created: 2021-07-06 13:27:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eed41de8c7f8f31ea61b86d6f00e0973 SHA-1: fbbef9e8c3f8ab899aef723726249646b5ff26ed SHA-256: d9a7ac7f910c0c17e94396cfd9abd5260a10254a8c32a22c4864c20a81357680
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to lure users to potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/minecraft-hacker-mask-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-in-game-money-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pubg-uc-180_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-blue-adidas-shirt-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-village-4_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_off00002c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C81 22816 bytes
SHA-256: ac42a5069f0fa5b5bfdc2c8bef695d5bd7e40ffb4d63a93fc70a1ace3b8833e1
font_01_sfnt_off00005e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5D 18024 bytes
SHA-256: 1c9d96dc2872e32a417b1efa44fe2d308041ce7ded0f789352e35eeb38f40ed7

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