Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abc2f7f25854c42…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 13:57:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dd5ac263d8831186297a1db23ea9f9f8 SHA-1: 078e29df28b52fac6b67f7c657edaf66023cc19b SHA-256: 3abc2f7f25854c42da191120f4fd595d2c4a0662c8565cebbb53fa08c2e4f288
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, such as 'robux-free-giveaway-2021-game-hack'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with deceptive lures. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves social engineering through fake giveaways to redirect users to potentially malicious content.

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/robux-free-giveaway-2021-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/pokemon-go-free-friend-codes_GM1094591345.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-2021-where-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-limiteds-comlu-com_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-link_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_off00002cc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CC7 22824 bytes
SHA-256: cf120c2917d804cc3f2cf9635043898c2ba72ffd68e93fbaaa26d5900ec68f64
font_01_sfnt_off00005fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 19696 bytes
SHA-256: 32ef65d612c1ac8315bf1bcbe54acb378d8b07765672c741bebac16b2f02dfab

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