Malicious PDF — malware analysis report

Static analysis result for SHA-256 27656d1da96d6039…

MALICIOUS

PDF

43.8 KB Created: 2021-06-11 03:01:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0105ee7dacc56e079a89b8177063cd7a SHA-1: b54bc21e85676dbd288f6544976729ee3a4247c1 SHA-256: 27656d1da96d60398cbc30841439287bb4737fa18af3ac67b139e1574db53d0b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to known malicious redirectors and a link farm, masquerading as game hacks and free generators. The primary malicious URL identified is https://netcdn.tw/app/431946152/robux-hack-inspeccionar-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure to external malicious content, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/robux-hack-inspeccionar-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-on-roblox-simple_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/3-ways-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/client-minecraft_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-use-cheat-engine-on-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/get-coin-master-hack_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_off00004eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB2 24652 bytes
SHA-256: 6a1bb1f556aa6f27cc3ebb1185aa8b1955221176d921b5e4443e0a19ebd01c8e
font_01_sfnt_off00008788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8788 18544 bytes
SHA-256: ad1b068e943a152b90b393346bf0b7aef505fa14832ec724e4b2a87634202d78

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