Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae33fc0b1e350e1f…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 23:18:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 10bc239dfc126a22e2c5598812788c2b SHA-1: 615137a229d874e0006ffb6940d5084d94c45987 SHA-256: ae33fc0b1e350e1f62e2fc3e7318c26bc9f6b09c3ef294a5b91dc7d19152275b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, including one disguised as a 'free generator / game hack' lure. This lure redirects to a link farm containing numerous other PDF documents, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes. The presence of a 'ClickFix' heuristic indicates the document may attempt to trick users into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-ps4-code-free-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-hack-tool-download-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-bedrock-free_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_004_off00005261.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5261 28424 bytes
SHA-256: a23c29b5cbd846fbeaf831e5c50933af3ccb439b99836c7e7caa68c6536896b1
font_01_sfnt_off000092e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 18100 bytes
SHA-256: 40a9ed8622610cf9fa8ac72a3ea4b6e6139de9a15da6eb4025f174f8e2de1100

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