Malicious PDF — malware analysis report

Static analysis result for SHA-256 49baa9c2ac1db905…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 13:28:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 018ea181ce1953703a717aea2fd78b41 SHA-1: adbc43119ad8e3e3986701483d324e696d5635a6 SHA-256: 49baa9c2ac1db90536146486518e2f23a109c1d02c6114dbca0a5660628fa548
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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/431946152/how-do-u-get-free-robux-game-hack PDF link annotation
    • http://perpustakaan.iahntp.ac.id/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/pokemon-go-free-team-medallion_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-download-minecraft-for-free-ios_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_off0000526a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x526A 26512 bytes
SHA-256: 8159a8fd08707c054776dac67670246e54e474a135e64f1326dd68403808d136
font_01_sfnt_off00008f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F34 18636 bytes
SHA-256: ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e

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