Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e5a7654bcf482b…

MALICIOUS

PDF

45.7 KB Created: 2021-05-11 19:24:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b353741265b32b07369548067b38f5b9 SHA-1: 928f7c0d138538a1359a956095267627762da5e1 SHA-256: 28e5a7654bcf482bdac5be2bac73c94abe05654f0173d531aae9e3015e6f0e0c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector for game hacks. The document body and heuristics suggest a lure for free game items or currency, often a precursor to malware delivery or phishing. The presence of numerous related PDF links further supports a campaign distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/minecraft-wurst-client-game-hack In PDF document text
    • https://mbbs.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-gratis_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/app-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-ios-no-verification_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
stream_003_off0000492d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492D 35340 bytes
SHA-256: 4b6b0ce136e5a7d1b5b23457415d8cb3806ec153a01e7de5e43d0eca62746187
font_01_sfnt_off000091d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D1 17980 bytes
SHA-256: da8de394074f4ca1a4d818326f6763942cae13e643f91f1376333b749e0c27ab

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