Malicious PDF — malware analysis report

Static analysis result for SHA-256 1559493fe2b3dd68…

MALICIOUS

PDF

41.3 KB Created: 2021-04-26 08:51:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ae0334fc061b9d75f990efa13694ac19 SHA-1: 7275daaff10f067041f78890ac1fd8e5b028d761 SHA-256: 1559493fe2b3dd6827ed20a6344362c341909335fac96ff42774d8313d26b7aa
208 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to malicious redirectors, specifically advertising 'free generators' and 'game hacks' to lure users. The document body and heuristics indicate a social engineering attempt to trick users into installing unwanted software or visiting malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/how-to-get-roblox-admin-for-free-game-hack In PDF document text
    • http://www.drent.se/images/free-robux-codes-2021-may.pdfIn PDF document text
    • http://www.drent.se/images/roblox-hacks-no-download-2021.pdfIn PDF document text
    • http://www.drent.se/images/roblox-glitch-to-get-free-robux.pdfIn PDF document text
    • http://www.drent.se/images/free-stuff-to-get-in-roblox.pdfIn PDF document text
    • http://www.drent.se/images/yarxvin-roblox-hacks.pdfIn PDF document text
    • http://www.drent.se/images/roblox-high-school-how-to-fly-for-free.pdfIn PDF document text
    • http://www.drent.se/images/hacking-my-friends-roblox-account-ant.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-cheats-in-roblox-jail-break.pdfIn PDF document text
    • http://www.drent.se/images/como-hackear-una-cuenta-de-roblox-2021.pdfIn PDF document text
    • http://www.drent.se/images/free-roblox-hacks-money.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4227 26444 bytes
SHA-256: f5a5d239970abbc51cffb82cb4bc600d0a6035fc3abb0bc7d59b77ee53987f1b
font_01_sfnt_off00007e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E24 18772 bytes
SHA-256: ccaaa2b2f3083095740d3adea850cc85fb01f44ca1171f88682bb3ebd0ce5d37

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