Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b53b5458cdd780c…

MALICIOUS

PDF

43.4 KB Created: 2021-06-14 01:05:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 894131a6349a8dc0a4feb237115358bc SHA-1: 31573a11d33518f4969dd8926084ec04a842410d SHA-256: 9b53b5458cdd780c4f18fd443fb3450c335d3fee1cd6d5af0f7fda0dbb8d41a9
220 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a primary redirector URL associated with game hacks and free currency lures. The heuristic firings indicate this PDF is part of a link farm designed to drive traffic to potentially malicious sites. No scripts were extracted, but the document body and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-sans-shirt-free-game-hack In PDF document text
    • http://bw.ac.th/userfiles/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/is-there-an-actual-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-hack-free-robux-hack-2021-ios-android-pc_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-more-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
font_00_sfnt_off00004929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4929 27264 bytes
SHA-256: c0f0d00ba74762fab41a8c5eb1799be8dbfa3a9cbb813eb5190a84adf3462e9a
font_01_sfnt_off00008677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8677 18564 bytes
SHA-256: 52c0604dc64b5c782372121354d1d456b310b4769d0da17644526b8fc0f13017

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