Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8fc618cc9666ce…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 06:26:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 85b443dfda3398ecd4d09d260d4c6c4d SHA-1: 349bf6af4611ac068424a7c5e088e7d04cd18a4c SHA-256: bf8fc618cc9666ce0a7d872bb1d6a8a87b1b59e860e118ee5aa0313be9b45648
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including a primary redirector URL associated with game hacks and free currency lures. The heuristic firings indicate the PDF is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the document body and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.online/app/479516143/minecraft-that-you-can-play-for-free-game-hack In PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/robloxs-got-talent-piano-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/hawt-sauce-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x534B 25840 bytes
SHA-256: 0aee6dfc69e2d1a80f0117f22390644f12958abd46f40415de913aca6f8e7ec1
font_01_sfnt_off00008c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C19 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000095cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95CC 18588 bytes
SHA-256: c2b8d9ff41b5817f39fe12fa9914c2498059949854f0a019c9b111e2507a5aed

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