Malicious PDF — malware analysis report

Static analysis result for SHA-256 c152a65409e1e108…

MALICIOUS

PDF

33.7 KB Created: 2021-06-25 20:08:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 09163332d750b4bb59da071465e9ae21 SHA-1: ab44eed81a728b4e1569403af4125215ad8f37c3 SHA-256: c152a65409e1e10894d5218655a0574ed1063c21e17957ee46f23597ffd70f67
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, identified as a 'link farm' by heuristics, promoting game hacks and free currency for popular games like Roblox and Coin Master. The primary URL http://netcdn.co/app/431946152/roblox-mad-city-xp-hack-game-hack appears to be a redirector for malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

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/roblox-mad-city-xp-hack-game-hack PDF link annotation
    • http://www.siahotel.com/userfiles/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/hacks-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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
font_00_sfnt_off00002cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAD 21748 bytes
SHA-256: 896f7606d81099efa57055cdd96fb2b7f0bcd3ed028cce740927fc3d3894cbfc
font_01_sfnt_off00005caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAA 19608 bytes
SHA-256: 67e333c212660d86955c274f4749d3af2090ab303213d10e078c1d02fc056a29

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