Malicious PDF — malware analysis report

Static analysis result for SHA-256 56940a0b623dbc9e…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 09:02:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d6fcbd8362d7939240cf0a524b7bd1e6 SHA-1: a7f375a9051a1995254d3dbadd688abfa0b59237 SHA-256: 56940a0b623dbc9e327bcd4943e9812e566a979be0c4fd47d44da2408148bd56
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors disguised as game hacks and generators, and presents a fake CAPTCHA to lure users into clicking them. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs point to known malicious infrastructure. The document's content and heuristics suggest it is designed to trick users into executing malicious code or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/how-to-hack-minecraft-game-hack In PDF document text
    • http://kingmusic.pl/images/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://kingmusic.pl/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://kingmusic.pl/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://kingmusic.pl/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/free-robux-hacker-us_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
stream_003_off0000487d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487D 28656 bytes
SHA-256: 2c834deeebb8bea104aef8ee34239a3667e88a7aa705c21014e6bec0cbf79351
font_01_sfnt_off0000874b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 18044 bytes
SHA-256: ee12250b32ae9257b8264adf9c9bd9c6b89cbb94dc70a51b2b21ac09721525f2

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