Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f4cbb58a40215e…

MALICIOUS

PDF

34.1 KB Created: 2021-07-01 19:51:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 12f66b0cdb69da3a3662f3bf84c62d4f SHA-1: 09c4e15d3c17aeb90ebe8d9d060882087f52e5bc SHA-256: 41f4cbb58a40215e2a4b36c55e49798bdb06068df2a3189795583043392e9fa3
220 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and SEO-optimized PDF files, masquerading as game hacks and generators. The primary redirector URL is http://netcdn.co/app/431946152/roblux-robux-hack-game-hack, which is associated with malicious activity. The document body and heuristics indicate a lure for free game currency or hacks, leading to a link farm designed to attract users through search engines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblux-robux-hack-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/free-wknd-strucid-alpha-roblox-lua-script_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-games-at-roblox-com-htm_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-inventory_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/mega-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-activation-code_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacks-fr-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-in-youtube-with-writing-roblox-retail-tycoon-shop-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-2021-no-download_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-cheat-engine-duplicate-assassin_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-no-tradeing-no-geting-band_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-blogspot_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
font_00_sfnt_off00002f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F80 22232 bytes
SHA-256: 4b7e18ce40ec4952f3b9667b16180ccab0baaec66af41af751ccc1b502e49c80
font_01_sfnt_off000060d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D7 18796 bytes
SHA-256: 58e40c3e34269ac79a69293d758287f00fb69b9f118cdf42477d519cc60fb10a

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