Malicious PDF — malware analysis report

Static analysis result for SHA-256 8874cd3d64f1cf53…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 18:10:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 05549d7c27a9f2dd2138989a32731be1 SHA-1: 1bcd1c9d85710eb8b91115816301a40bd9182d88 SHA-256: 8874cd3d64f1cf5341fa22db3a47f264c0ffd5f1b7d0a42131914346fc09533c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to 'free generator' or 'game hack' lures, indicating a link farm or phishing campaign. The primary URL http://netcdn.tw/app/431946152/free-robux-earn-game-hack is likely a redirector to malicious content or a phishing page. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to drive traffic to malicious sites, likely as part of a broader phishing or malware distribution effort.

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/free-robux-earn-game-hack PDF link annotation
    • http://perpus.ftunismabekasi.ac.id/repository/free-kawaii-bread-t-shirt-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-report-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/tiktok-free-hong-kong_GM835599320.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/treasure-hunt-simulator-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/ultimate-game-365-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-free-robux-with-password_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-fly-in-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/hacks-in-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-apocalypse-rising-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-make-a-free-robux-game-v3rmillion_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-murder-mystery-2-candies-hack_GM431946152.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_off0000323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323D 22944 bytes
SHA-256: 6a1997748df95e5b8e2e72648707fba4d71198d72b44deb846b0b712e602f7f9
font_01_sfnt_off000065b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 18716 bytes
SHA-256: d0fd5caa07bd2994d5aead91e3f120989a872bbf6995ac2693ef7a49b18a3472

Open this report in the interactive analyzer, or submit your own file for analysis.