Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f8fa3d7aaaacb1…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 01:36:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4cb35a1eed6b45f357750af2fbfd362a SHA-1: 05b7c9d9320401906db467257634f9a0c72ed473 SHA-256: 76f8fa3d7aaaacb1d83a74ebec6369e42409e26cf5592a78f3b100622ff6ba81
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.tw/app/431946152/what-are-points-for-in-roblox-game-hack PDF link annotation
    • http://autoskola-scp.com/files/how-to-hack-people-for-real-on-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-rogue-lineage-hack_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/robux-hacks-that-actually-work-for-everyone-on-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/pokemon-go-basic-vs-premium-rewards_GM1094591345.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/do-you-want-some-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-do-you-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-coins-2021-coin-master-link_GM406889139.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_off00002eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEC 22208 bytes
SHA-256: 8ac94494d45b98fa1a198b97016fb6d5b42155599159b4401233c3eafe794340
font_01_sfnt_off00006021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6021 19392 bytes
SHA-256: 6ee4c6c2bc36e9485c1d8e6afcd62cc66d60928b15140094b1d26536a429f836

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