Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03dc364e82ed73f…

MALICIOUS

PDF

43.3 KB Created: 2021-05-19 22:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de87ef0e727ea9a6a73e84415a53a7e5 SHA-1: f6ee6ae4849d65914a78478c51d6dfe15998766d SHA-256: f03dc364e82ed73f5a3a21c212563a87edb2dd83109368106bb7b3b9c66fb2db
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links and a fake CAPTCHA lure, indicating an attempt to trick users into downloading malicious content or visiting phishing sites. The document body and extracted URLs suggest a focus on game-related cheats and free currency, a common lure for malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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.
  • 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.xyz/app/431946152/robux-free-com-game-hack In PDF document text
    • http://www.flotom.at/images/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-map_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/100-free-spins-coin-master_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
stream_003_off0000486d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x486D 27500 bytes
SHA-256: 61a6d9f7320875117a2212a84a79cc97d61de8c7a05ce42c83168983b69c48b6
font_01_sfnt_off0000870f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870F 18276 bytes
SHA-256: 0fd65c317a1abc649e3faff400e4768e1aa7d1dd6ac5589c15474ffa47aab2c1

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