Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9943f14cd1de0d…

MALICIOUS

PDF

44.7 KB Created: 2021-06-04 01:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3eb604c2a31bff52ee855425ce0ad945 SHA-1: a0e5021b326cc325e5d407ebf863558226944745 SHA-256: bc9943f14cd1de0da171455d64aeeab39b3daf192d049da0bcf66b05c46de76f
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are disguised as PDF documents related to game hacks and free currency. The primary lure appears to be 'free generator / game hack' sites, indicating a likely attempt to redirect users to malicious content or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/479516143/minecraft-free-download-game-hack PDF link annotation
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/how-often-pokemon-go-free-download_GM1094591345.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_off00005259.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5259 25548 bytes
SHA-256: 0cb6c00e96a218b2b4a6210b845424a1dafb76f3f7deda5f666e162b9481c0d3
font_01_sfnt_off00008c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3C 18292 bytes
SHA-256: eff5919d985126b8591bb7cd3dea6a103dcf6f67049ada279646be2986fdbf31

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