Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdeaae1b9ff371b…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 00:56:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fda28109ad1eec353df4c3595b2e8230 SHA-1: cdd8a5e000dceaa8524652c223c2b896398c2578 SHA-256: bfdeaae1b9ff371bf1a035a5d04aef0ec25977c2f61ab88292ea75008fdd298d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing themes of game hacks and free currency to entice users. It contains numerous links to external sites, including a primary redirector at http://netcdn.co/app/431946152/roblox-cash-free-game-hack, and a large number of links to PDF files hosted on repository.ummy.ac.id, forming a link farm. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/roblox-cash-free-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-tycoon-hack-no-donate_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-free-skins-in-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/competition-for-free-robux-no-lie-still-on_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/i-am-now-crying-for-being-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-roblox-gift-card-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/cheat-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-promo-code-hack-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-free-gamepass-game_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/image-veste-army-free-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/bp-to-uc-pubg_GM1330123889.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-giveaway-live-stream-now_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-roblox-free-clothes_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
font_00_sfnt_off00003177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3177 22300 bytes
SHA-256: 63ba0e6a05a755d9d7d3e4d671bb250562e427f12fa0febe44127e784cebc81e
font_01_sfnt_off00006351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6351 18816 bytes
SHA-256: 864494f7c28eecc55c1b2bf6dcb51aedcad3031e5f805c94c79e1af31fb89a1d

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