Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e66604c0b36ff6c…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 13:40:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 825253dd9d9163af33b65f99880b2453 SHA-1: 04de43bb9376b390a44fd7754d25673f093103b9 SHA-256: 4e66604c0b36ff6c4f69d4a34671fd50b32db60fe191e6ed0de8870c1334de7b
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The primary lure URL is https://netcdn.tw/app/431946152/free-robux-for-ads-game-hack, which likely leads to a second-stage download. The document body and embedded URLs reinforce this social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-for-ads-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/pubg-uc-on-discount_GM1330123889.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/tiktok-free-view-your-liked-videos_GM835599320.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/auto-farm-hack-boku-no-roblox-remastered_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_off00004f31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F31 25796 bytes
SHA-256: 9fd495f3f114f8220f815d85bf21102b1beface2660fb45ad0cede2f65bc95cf
font_01_sfnt_off00008b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 18188 bytes
SHA-256: 0cb38c119f58b065a26b08077322d4088b7ddcc6fa73543e417e7d1105a1e64e

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