Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72adae5cd196f84…

MALICIOUS

PDF

45.6 KB Created: 2021-05-12 05:38:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1ef63e7e78bab18857b8b5ed537601ef SHA-1: 2266cdd382ded8bc3439ba24c353b41d38d82227 SHA-256: d72adae5cd196f84afd1ab1a45df8bf88c266e52aa94b4fef85190fc4be9302f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a malicious website, identified as a 'game hack' lure. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking these links, which likely leads to a scam or the download of a second-stage payload. No scripts were extracted, but the embedded URLs are the main indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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 https://netcdn.xyz/app/406889139/coin-master-hack-online-cheat-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/rbx-website_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-coin-app_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D01 25252 bytes
SHA-256: 6d3f4ecfc4541280d156f1da277c59287f1ce7ff39befbb8e20236e0d8380501
font_01_sfnt_off000085b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B5 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off000090b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 17956 bytes
SHA-256: 443aed1378757c773e02f5a5987283787609be462fae8ba99418116e4694aa7f

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