Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b6a2df3ffd007b…

MALICIOUS

PDF

35.6 KB Created: 2021-07-20 08:31:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 365eb71e4ff49b5de70e9d9969724e35 SHA-1: 412980441921eb2df7ba1431f3e28fce2c54d76b SHA-256: 41b6a2df3ffd007ba5a3b23cb021cbfebac587aae3bf996bf5213003b46b3402
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a 'game hack' or 'free spins' generator. These links redirect to malicious infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-free-spins-link-2021-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs strongly suggest a phishing or scam attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.tw/app/406889139/coin-master-free-spins-link-2021-game-hack In PDF document text
    • https://lamascheradiferro.dk/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://lamascheradiferro.dk/images/roblox-studio-free-robux_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_002_off000032b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B8 23772 bytes
SHA-256: 7614d4591e069a4a7dd61e287b11edfecc0648515bd0a819bee893fc40ffbdc5
font_01_sfnt_off000068d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3