Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9566fd43e7a1f66…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 03:02:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 14b7519e73f799abaeba048e21436041 SHA-1: 6975ab45a40134e1c79fa12e39050785e549ff32 SHA-256: f9566fd43e7a1f66cfc0aa67572d41a955d189c5ae691ae98574d589bca730c0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical redirector link to 'http://netcdn.tw/app/431946152/get-free-robux-com-game-hack', which is associated with game hacks and free in-game currency lures. The document body and heuristics indicate a pattern of linking to external PDFs, likely to create a link farm or to direct users to potentially malicious websites. The ML classifier also strongly flagged this PDF as malicious.

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.tw/app/431946152/get-free-robux-com-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/what-is-tiktok-make-your-day_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-hack-no-reward-in-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-vip-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-free-vpn-android_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-using-money_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-verify_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_off000030b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B6 22024 bytes
SHA-256: 951f2fa96fa482972aba249046b42bebbc3d3786b0282fdb73a03006d303ee55
font_01_sfnt_off0000614c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614C 19080 bytes
SHA-256: bd48df5b3587c62f460ac4547970d78652d76b982da8f06603591dccd4bca80f

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