Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff2bf96d7c0debc…

MALICIOUS

PDF

46.7 KB Created: 2021-06-04 03:41:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 224a13e0f349c44ec5ef8a838abc977f SHA-1: 03780241a06e56e28a76d7e1bb9558e560f1e2e3 SHA-256: bff2bf96d7c0debc86080d692136c3a2028d18af85a4825609195bbfd5830abb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains multiple links to known malicious redirectors and sites offering 'free generators' or 'game hacks', aligning with social engineering lures. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The heuristics indicate the PDF is designed to trick users into clicking malicious links, likely to download further malware or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://netcdn.online/app/479516143/minecraft-alt-accounts-free-game-hack In PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/tiktok-free-mockup_GM835599320.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AD 25452 bytes
SHA-256: ffdd01d0eab295ca48f3278e70a378274c9b4eeb1cc1911d803a2cdf213dbc91
font_01_sfnt_off00008b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4D 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9500 17924 bytes
SHA-256: cf9503bd7fd14ff3d5423dc2d723381d788b8b94e195509a39a62f811928e518

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