Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ff4ca7353d293d…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 07:11:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 10f7e57294ae301bb4158a6036610dd6 SHA-1: a22a9eedd98b76541a76465451ae6f065afa4696 SHA-256: 32ff4ca7353d293dc45fd171fbb497f3dfb8bfd63f08867357c4fa61d06d1b34
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/how-to-get-free-spins-and-coins-on-coin-master-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-printable-roblox-coloring-pages_GM431946152.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/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/pro-pubg-xyz-uc-hack_GM1330123889.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/withdraw-robux_GM431946152.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
stream_004_off000052d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D7 24768 bytes
SHA-256: aa0910d6da2a64eedaed6a179708f74d5b99d6646c1d8ee19d083bcebdc9a50e
font_01_sfnt_off00008bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC7 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000095b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B2 18224 bytes
SHA-256: c3eeb8e5bbecb0a66d0dccf890560b2772aaf25cfcf2943a976e8e45774626aa

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