Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e2faa9da851c64…

MALICIOUS

PDF

34.8 KB Created: 2021-06-18 19:10:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ad4878ac80772b001c8d0c10a2ac269b SHA-1: 6ae3ec4aa327462f8b6301675a548a2bf04b8e8d SHA-256: 25e2faa9da851c640592ecc48053a4180ed0444adfe26776e2b519f663772f6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game hacks, directing users to a malicious URL. The ML classifier and specific heuristics confirm the malicious nature of the embedded link, which points to known malicious redirector infrastructure. No scripts were extracted, but the document's structure and embedded URL strongly indicate a phishing attempt to redirect users to malicious content.

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/www-free-robux-hack-game-hack In PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/20k-robux-accounts-free_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-free-download_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-robux-quick-generator_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/minecraft-18-9-hacked-client_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
font_00_sfnt_off0000317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317E 22104 bytes
SHA-256: 88f64428b31f635569121d94c3a7c33c1cbd8bbdbb827e79983f6d0b9c164782
font_01_sfnt_off00006280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 19248 bytes
SHA-256: 4b4c0f8afd5092f9afb19d7df93bdd93b6e5fbab73694816bd30e9f8217b1440