Malicious PDF — malware analysis report

Static analysis result for SHA-256 78313434254047c1…

MALICIOUS

PDF

47.8 KB Created: 2021-06-11 11:43:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 26bb754efb8d71d5e99b8936ddb67047 SHA-1: 8c477e0ab0b43afbd2407b901ddbf83bc4df5a67 SHA-256: 78313434254047c195e3ebc73653d965fbfe45e36f4ca28a06a6f86326c18a5f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.
  • 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/zombie-attack-roblox-cheat-engien-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-into-people-roblox-account-pastebin_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pubg-uc-or-pc_GM1330123889.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pubg-5-uc-buy_GM1330123889.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/instant-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-lumber-tycoon-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-roblox-skins-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-gift-card-generator_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
stream_004_off000052ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52ED 30900 bytes
SHA-256: 4b917c3ca8cd458a63278dcdf28f044003f03ff685fbfebfd5c199f67f553204
font_01_sfnt_off000095f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F4 19216 bytes
SHA-256: 7eca2dc078869438ec4d63a94921883da9e638aa71ee19c0ae0369d3e6ae02d3

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