Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c4992af59b621…

MALICIOUS

PDF

35.7 KB Created: 2021-06-20 07:17:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d24ff6677a58a7b473995eac2d703bf6 SHA-1: 6f91b0ba3c405ccb41b4d327f5a63f3d70311338 SHA-256: 091c4992af59b621fb83bb1cc63463f71ecf4556139623c7c05cda8080adee0a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one pointing to known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks and generators, aiming to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow designed to trick users into visiting malicious URLs.

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/how-to-speed-hack-in-roblox-with-check-cashed-2021-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/any-cheats-for-tycoon-roblox-games_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/top-10-mejores-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-that-really-works-that-dont-need-human-verifacation_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-accounts-not-taken_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-download-ios_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_off000030d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D9 22504 bytes
SHA-256: c2181952a6a8a0e3b2f52bf793a64152519f8cd381ed84490ddc4889064ebdd3
font_01_sfnt_off00006309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6309 20160 bytes
SHA-256: 394c3de65eef35c9d545b36f31526fa4f8a72ac49bf3120e601f1e3672b9f270

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