Malicious PDF — malware analysis report

Static analysis result for SHA-256 933219e8ccbe710f…

MALICIOUS

PDF

35.6 KB Created: 2021-06-18 03:19:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cfb298d74b7b47dd187f772c69921955 SHA-1: 00d3d403a1e4544ad42aa07bd32c61f3c6252350 SHA-256: 933219e8ccbe710faa821578891c5835051b1f219788b4d75ab772977a799fcc
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-codes-unused-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/trigon-best-free-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/5-dollar-roblox-gift-card-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-giveaway-website_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-spiderman-package-full-suit-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3370 22680 bytes
SHA-256: 0404eec0c7c7e82865fd44ee84d275080ac448f3a2114ef99fc46d88a86aa9c4
font_01_sfnt_off00006641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6641 18964 bytes
SHA-256: 03392daea0a65cb380aca9792bd495ea99f4d01e52f3c17d9c74af1e97b9dcfd