Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3821485c54fb749…

MALICIOUS

PDF

47.1 KB Created: 2021-06-07 23:30:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 558fda69236b076c8d921f9d2fd33052 SHA-1: 3ea823955d5c786d542dd4f6df28ef92290e0d7f SHA-256: c3821485c54fb7491079c8bc415be3846390af7229ae0eeaa2ae679a2e15c0e5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks. The embedded URL leads to known malicious infrastructure, suggesting an attempt to trick users into downloading malware or visiting a phishing site. No scripts were extracted, but the document's structure and links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • 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.
  • 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/how-to-use-cheat-engine-on-roblox-prison-life-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-through-walls-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spins-coin-master-app-iphone_GM406889139.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/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-account-generator-with-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-any-hat-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-money-on-roblox-a-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-uc-rate-in-india_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-accounts-with-robux-2021-november_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-anti-cheat-speed_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_off00005483.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5483 29180 bytes
SHA-256: 2d4b6544ce29d4dcf71303190d5a134916c50d36319b590e7853eb6ffa11bce3
font_01_sfnt_off00009304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9304 19196 bytes
SHA-256: 68bb36ed383725a5bf4a957f2d51de24a0f981286c2a53ea5b5d36ed5ae8d2ed

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