Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c76706b4b4845c…

MALICIOUS

PDF

32.9 KB Created: 2021-07-04 06:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 76ed91352deb8a1690100d46fdb686eb SHA-1: b9d02d3cd00a15535404c032df4113f4b0bc190c SHA-256: 50c76706b4b4845c1b794af58003924881ac9be04b5154bb447b984e2ed0320c
180 Risk Score

Malware Insights

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

This PDF document contains a malicious link disguised as a "free generator / game hack" lure. The link redirects to known malicious infrastructure, indicating an attempt to exploit users. The malformed stream length and ML classifier also strongly suggest malicious intent, likely involving exploitation for client execution.

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/431946152/free-robux-gen-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/10000-robux-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-robux-free-fast-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hacks-jailbreak-wearedevs_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-hack-no-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-mobile-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/bloxy-site-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/nnuevo-hack-de-robux-2021-atualisasion_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-zombie-attack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-fun_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-no-downloads-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-inspect-code_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/his-girlfriend-cheated-on-him-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-cheat-in-roblox-counter-blox_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_off00002db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB1 21332 bytes
SHA-256: 4dc53c32b76e6c702c9e1570ca12011aa83460c6c8ac4f5118dc16ee83912960
font_01_sfnt_off00005c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 18716 bytes
SHA-256: 241c7495b7b7869825a77847e0d47c1d78029990e0b32ebb48689777b4105741

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