Malicious PDF — malware analysis report

Static analysis result for SHA-256 c163de670af9dbe7…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 07:05:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5011bb31dac1304e4ad24abaab2b58b4 SHA-1: 391209984bf827d8cb8acbe3eac38e4472b390d2 SHA-256: c163de670af9dbe7f5c5f38dfc690252ca5a8b8811de695638608da1dccf30b0
160 Risk Score

Malware Insights

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

The PDF contains multiple links, including one identified as a malicious redirector, which is designed to lure users to a 'game hack' site. The document body and heuristics confirm the intent to trick users into clicking these links, likely leading to further malicious content or exploits. No scripts were extracted, but the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack.

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/406889139/coin-master-free-spin-and-coin-link-app-game-hack In PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-accounts-v3rmillion_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/ihacker-space-de-remove-space-free-robux-obc-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-things-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/tiktok-free-invitation_GM835599320.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-how-to-make-a-promo-code-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-generator-2021-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/tiktok-fame-free_GM835599320.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/case-clicker-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/get-100-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-hacks-exploits-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/pubg-600-uc-in-indian-rupees_GM1330123889.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/best-way-to-get-free-robux_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_off000030a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A9 22360 bytes
SHA-256: 4605fdc720484a64960ad78378146be7adccc552d21b15eb78b87ab983055416
font_01_sfnt_off000062a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 18520 bytes
SHA-256: d69a0a2edd95f9e38b96bcbf992a69ddda142703a71f9cfee81eaec1a075863f

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