Malicious PDF — malware analysis report

Static analysis result for SHA-256 749f82c9c9a649b8…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 21:10:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7f5ef6bfcdeff9220f870b036f5b4c6b SHA-1: 00baaf081a3f3f8a9d078e813d3c5a2b466b7305 SHA-256: 749f82c9c9a649b814722921d6c187fffb8e590f5a4580a9581428a0486f576c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The document body and embedded URLs reinforce this lure, directing users to a URL that likely hosts a malicious payload. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/safe-hack-for-coin-master-android-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-code-gen_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-python_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-cheat-on-eviction-notice-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-download-xbox-one_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-com-hack-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/boku-no-roblox-remastered-hack-chose-quirks_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-android-oyun-club_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-forsaken-sword-3-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/pokemon-go-font-free-download_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-windows-10-hacks_GM479516143.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_002_off00002e37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E37 23092 bytes
SHA-256: 331bac55c7bbf6007fa3be07dc3d831629d94161d224c128f6fbb2b1ca87d141
font_01_sfnt_off000061ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EC 18340 bytes
SHA-256: 43764a5b5f6c046282fd902f1ca36491120c09c6eac2ad81530e8a3df6adcbf7

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