Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7cfc758991391d…

MALICIOUS

PDF

43.4 KB Created: 2021-05-19 02:20:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2c24f33a4041f687f03195d68f6f0641 SHA-1: c7ff1d06b614be8913c3d93c35992e2ccc47af65 SHA-256: cc7cfc758991391d9ec60b3ac974d92ada4e038109d0c349e9bfd6033b1b157b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one identified as a malicious redirector, designed to lure users into clicking on 'free generator' or 'game hack' content. The primary malicious URL is https://netcdn.xyz/app/431946152/free-robux-generator-no-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/free-robux-generator-no-verification-game-hack In PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-adder_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/wurst-minecraft_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/wurst-mc_GM479516143.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
stream_003_off00004b5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5A 25696 bytes
SHA-256: 0b6f2c96265372146953b2f2ff39c0b466a1fa8be270e27465a85dab2e85e021
font_01_sfnt_off00008669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8669 18600 bytes
SHA-256: fd611ad94f1c5362e5936d61a0ca6686a852f181e3b69dadbb107f1a26b259f7