Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c584f5e2dd3b983…

MALICIOUS

PDF

34.6 KB Created: 2021-06-22 09:34:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: df1c5658ed803ae8bb144b4189d21316 SHA-1: 9d5f70afcb3c815b0708be58eb38d7e91f56f8ef SHA-256: 9c584f5e2dd3b9838f051aebb55b4ddd11f8f4cd1e042d2dd19584d6be190ddd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-unused-roblox-codes-game-hack PDF link annotation
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-gift-card-roblox-wix_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-builders-club_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/play-roblox-for-free-online-now_GM431946152.pdfIn PDF document text
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-is-being-hacked_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_off000030c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C2 22360 bytes
SHA-256: cd1647625b8065dc5485da91b3cc6254cd4afc382e3ec2751950ebdb96da4538
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 18964 bytes
SHA-256: 06d05345ccd6eac800dead277739863527d31be35714cb2255557a993cc3793f

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