Malicious PDF — malware analysis report

Static analysis result for SHA-256 83520b93c04f3aff…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 09:34:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3ad7a962a0f900482e21d7c2e36235b0 SHA-1: 152990b72af50bec157c3d7ebc9ea0802d3cf5bf SHA-256: 83520b93c04f3aff9b5398a0beae163d00d9781694faf52452feb67a1c6e52a6
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting "free Robux" and "game hacks". The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 4

  • 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.
  • 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/free-robux-live-stream-game-hack In PDF document text
    • http://szekelymozes.ro/images/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-open-cheat-engine-without-roblox-shutting-down_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-tiktok-followers-trial_GM835599320.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-do-i-get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/is-free-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-robux-ios-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_004_off00004f56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F56 27100 bytes
SHA-256: 6b5be54dca6e7b57d7a2f48c474e7c574a31746734b4ed794d0cf40c3183049a
font_01_sfnt_off00008c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6A 18840 bytes
SHA-256: dfc8e512d57cf091cdcc01b0b08bcc6a59e806bab1e5f6d362f81d2a58d468d4

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