Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf7c329d26dedb7…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 12:04:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: db0f86507f5b9bc420f078e32e2ddcaa SHA-1: f392d410e74fc50c291a2ecd52299204ebe6259f SHA-256: acf7c329d26dedb7b63bd6c5519fecb12fe7dfdac226921179e5b6716525ad2f
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/406889139/free-spins-coin-master-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/cool-roblox-outfits-for-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-roblox-clothes-temp-downlode_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-one-punch-man-unleashed-script-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-ranks-in-a-roblox-group_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-admin-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/scirpt-hack-roblox-vh2_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/como-tener-hack-para-en-roblox_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
stream_002_off00003300.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3300 23228 bytes
SHA-256: 86a3c043789f166369ab6d7347627300da017905c4f782f53b6843c347c92d87
font_01_sfnt_off000066f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F1 18176 bytes
SHA-256: e8ec895f495d139acdb298d515a7ca0fffd25b58e102aa71b0a100d8abb1bbce

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