Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4a6cd1acd40cf1…

MALICIOUS

PDF

35.7 KB Created: 2021-06-20 09:38:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9881874852be41ec2a3add631feb5aaa SHA-1: 8f22394a264a29c092dda4206a1f76a58c8ea851 SHA-256: 8b4a6cd1acd40cf10a77de5c50ba235cd7f84743519c65d6c3de6ec47e0102b1
160 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/best-way-to-get-free-robux-legal-game-hack. The document body and embedded links suggest a lure for free game currency or hacks, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and malicious links indicate an attempt to exploit users into visiting harmful sites, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/best-way-to-get-free-robux-legal-game-hack In PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/are-pubg-uc-available_GM1330123889.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-roblox-usernames-and-passwords-not-changeable_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-many-warning-for-hacking-do-you-get-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/entry-point-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/cm-spins_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/roblox-link-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/easy-robux-hack_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
font_00_sfnt_off0000324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324C 23200 bytes
SHA-256: c7501cb0b21a42dce990aff09c88d4ef1fd650f81df86a1efa6c266571ddd998
font_01_sfnt_off000065b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 19272 bytes
SHA-256: 51736c59e75635448ed5e2dbe7216e806b68ccc7aa106ff097082c6000252881

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