Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab675027ff7a5db…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 16:40:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 232d45bc79778da855007785126128f4 SHA-1: d7afbdf636e8c1d8c29772378c531f14fc165637 SHA-256: aab675027ff7a5db66a2bc0421aea364604c633772bd8fdb9a84aebc092cb5fb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users to click on embedded links. The primary link directs to 'netcdn.tw', which is associated with game-related scams, and numerous other links point to an IP address hosting similarly themed PDF files. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of deceptive links for redirection, likely to a site that serves malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/oprewards-free-robux-game-hack PDF link annotation
    • http://118.98.227.172/opac/repository/free-coin-master-spins-daily_GM406889139.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/pepsi-hacks-roblox-script-cbro_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/female-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-pokemon-brick-bronze-cheat_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-free-stuff-for-avatar_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/cheat-indetectable-roblox-fly_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/rbx-com-free-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-fallin-roblox-id_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-in-roblox-on-phone_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-someones-account-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-to-get-nightblade-in-murderer-mystery-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/madcity-free-car-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-roblox-for-free_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_off00002e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E62 21484 bytes
SHA-256: 41a48e5ec97218d833d5f9612e7c63930401492c7fa44717bd96e4dff3f7199d
font_01_sfnt_off00005d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4B 19228 bytes
SHA-256: 28d2551d9716c0c1f642d1de59876c155fe982ad5f1d32fc26186d5dbb125a3e

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