Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab58d358ea684d06…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 18:26:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cf96f99371f794dd5e31cc78b5936037 SHA-1: acc333d57e83a331bb09cac411f81b04658b7216 SHA-256: ab58d358ea684d06f6616bbd4aaf2b85a7c31bbd28d5ae5443bc153377d8b22b
180 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as a game hack, which is a common lure for phishing or malware distribution. The malformed stream length and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users into visiting malicious sites, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/hackear-juego-coin-master-game-hack In PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/roblox-hack-mod-apk-2021_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/codes-that-get-you-free-robux_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/free-draw-roblox-discord_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/free-roblox-inventroy_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/how-to-get-free-robux-2021-no-verification-no-scam_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/minecraft-handbook_GM479516143.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/hack-roblox-online_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/free-robux-no-offers-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • https://amozeshportal.ir/assets/uploads/pages/files/coin-master-app-free-download_GM406889139.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_off00003137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3137 22640 bytes
SHA-256: e84d3065f7617041b89a86a50413f6d650d81cb947feb0e027dd2e763759271e
font_01_sfnt_off000063be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 18308 bytes
SHA-256: 3544d7e777192f16e01b415bbb4cc4ce382486f30b57fac35e8304f2910641cc