Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bf1b7733729396…

MALICIOUS

PDF

34.1 KB Created: 2021-06-26 22:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c3c458d77d739700e2b82d7b8169265 SHA-1: 182900284aac0d7c090bfb09528c47164907bd2c SHA-256: 33bf1b77337293967ae2ff45f4c91149a63c553269592ef60b67dbcb3c0d18dc
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.co/app/431946152/free-roblox-john-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-on-computer-no-survey_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/dragon-ball-legendary-powers-roblox-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/robux-inspect-hack-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/robux-place-rewards_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/master-8-ball-pool-free-coins_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_off00002e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E57 22620 bytes
SHA-256: 35525c2e09c1c87dafae6fb3253145e0d18199dddf3313386ec69113c7697501
font_01_sfnt_off000060b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 18984 bytes
SHA-256: d38a1333ecb16a43d04bb7f09b3a463c059d8b16556ca8b2f134b22906453cea

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