Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f963f39077f310…

MALICIOUS

PDF

45.1 KB Created: 2021-05-17 12:32:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c883c2b6242678a9bf9f49fe5c2fb438 SHA-1: c7cd41ad185c46b73f8fa67002c051ed6b17479f SHA-256: c4f963f39077f3103dd536f636ba9c165cd2a8ff3f3d30e4ad55077818b0fc8f
180 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a 'game hack' theme to entice users to click on embedded links. The primary link, 'https://netcdn.xyz/app/406889139/coin-master-free-blogspot-game-hack', is identified as a malicious redirector. The document also contains malformed streams, suggesting an attempt to exploit PDF vulnerabilities. While no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristics indicate a high likelihood of the document attempting to download and execute a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/406889139/coin-master-free-blogspot-game-hack In PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-hack-spins-ios_GM406889139.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_003_off000048b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B7 25140 bytes
SHA-256: f8f39c45b9f6cfb40907b9baa0fb59c726093b07a09ed7c835e9b0eec3149228
font_01_sfnt_off00008369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8369 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1B 18464 bytes
SHA-256: 3d1506adb004325b5ad849f11167115e1f90dbd1428f7e6d98779d75984a0c30