Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f707fbd31945c19…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 07:21:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ff1277f867924e4dc9c7b6da0682b7ee SHA-1: 318d8179455c1a878616c6da6b1109f4454d8151 SHA-256: 7f707fbd31945c1996c855701c8224465ebbd6a8caafad4d4ea6851ad0bb6847
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/431946152/robux-matchcomfree-robux-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacks-para-los-juegos-de-roblox-gratis_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-deutsch-auf-pc-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-glitch-site-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/dinosaur-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/flippy-hacking-people-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/est-il-facile-de-hack-sur-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/boombox-backpack-roblox-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-secret-forum-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pokemon-go-free-coins-no-verification_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-hack-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-use-cheat-engine-on-roblox-jailbreak-for-money_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/booga-booga-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/www-mistplay-com-how-to-get-free-robux_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_off00002cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD2 21960 bytes
SHA-256: 4398c1ea8caa03d701c8fca70ae9d8823b6c48e5f493bb44c283e8fc55ee5d10
font_01_sfnt_off00005d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 19276 bytes
SHA-256: e12eaa9ee56d2b4a0c3760d94e761e70928f2a8d30c5b38c78d7961ece11124c

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