Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fcb59b779850e4…

MALICIOUS

PDF

44.4 KB Created: 2021-06-08 10:27:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5a9c08300ee74e36dd39fcbb02c13ccd SHA-1: 35175c09aee419513467c158f6b12e0f8d8bded1 SHA-256: 32fcb59b779850e4cf5962ccea8a6f939260b0d5a7d09244389d379e7be1fc06
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA and a 'Robux Hack Generator' theme. The primary link directs to a malicious redirector, likely intended to deliver a second-stage payload or phish for credentials. While no scripts were explicitly extracted, the presence of PDF link heuristics and the overall theme strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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 https://netcdn.tw/app/431946152/robux-hack-generator-email-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-javascript-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-use-cheat-engine-on-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-anti-cheat-speed_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-install-hacks-roblox_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
stream_004_off00004da0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DA0 25712 bytes
SHA-256: 2d101e479230d4a1806ec20b9cdced803776f122e5302977913c52a9452dd4e4
font_01_sfnt_off00008940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8940 18808 bytes
SHA-256: 7f6c4cf3961b296ec5084979c8f214bbb1d929cea971371b171c386600bdfdd6

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