Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef80725bf849475…

MALICIOUS

PDF

36.2 KB Created: 2021-07-01 14:07:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a752d12d0bdd77bafd2d8a122ebd29a7 SHA-1: 23d7551434ee73b8724773691926e437c5ed2860 SHA-256: 2ef80725bf849475226b49c1428370a7f2a4c76b9f997dcd381fb91c7f7f1347
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures related to game hacks and free currency, directing users to external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to other sites. The ML classifier also strongly flagged this PDF as malicious.

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/fake-codes-to-enter-to-get-free-robux-youtube-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-fbi-open-up_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-know-if-someone-is-hacking-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/dashing-simulator-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-1b-on-roblox-and-patebin_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/strucid-aimbot_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/a-lot-of-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-do-u-get-free-robux-on-roblox-2021_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_off000033e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E3 23004 bytes
SHA-256: a7ffdbff2350e58f1ed6beaddfeb5bf79733f0b6861930b4ad726cd3c500098c
font_01_sfnt_off000067bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BB 19328 bytes
SHA-256: 6f856d42c91ca301520d40338f557028aef37608d9cf613a0fec966032b22cdc

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