Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c867bfaba62c57…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 19:16:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1d7b6214e782623a043459446df4da15 SHA-1: 4a79e1bdb007c81d5243258993d6859b03163eeb SHA-256: 43c867bfaba62c573ad0b7414a9ec3c5a99fd51d9524fe0e16a02627a1e86582
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks' for popular games. The document body and extracted URLs strongly suggest a lure for users seeking cheats or in-game currency, leading them to potentially malicious sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a malicious intent, likely to redirect users to phishing or malware download sites.

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.co/app/431946152/before-the-dawn-roblox-free-play-online-game-hack In PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-script_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/make-free-robux_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-serveys_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/cheats-roblox-survivor_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/easy-hacking-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/flame-gg-hack-robux_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/robux-hack-discord_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-hack-mpgh_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_off00002e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E51 22104 bytes
SHA-256: f9de40eb05343c9d22529cc0fe1a0e7dbeb30f99df37a20a910471ab13043d14
font_01_sfnt_off00005f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 19604 bytes
SHA-256: f3a16129fd546712161ee3e0601af759fd297145d62f7c1bee8d84da8a4cd523

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