Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8ce4672e020ebd…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 10:32:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 79065621c87256c0ab9765a7458034fe SHA-1: 228700a123cc9c98d1fd3a3ae04af17612830a59 SHA-256: 6f8ce4672e020ebdb25173613830f7021f53dd1d0c99372642aa526c6859f6f9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure related to game hacking, specifically for Coin Master and Roblox, to entice users to click on embedded links. These links lead to a known malicious redirector infrastructure, which likely serves to deliver further malicious content or lead users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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 https://netcdn.xyz/app/406889139/how-to-hack-coin-master-2021-game-hack In PDF document text
    • http://ff-klaffenbach.de/images/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/oprewards-login_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004911.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4911 24788 bytes
SHA-256: 9e690c050cbda4c36e1b1d4a509ca89eb1707203f7b6a2a0c106fe2210cb3a72
font_01_sfnt_off000080de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DE 18284 bytes
SHA-256: 2ae8d3f2cbcae8cb3753deb1cb0690858b25682b169ed1ca9b91685ca7cd6d7f

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