Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e2191b63e185bd…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 09:33:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 62fa307928be90a197842fe4d5da6550 SHA-1: a925df666a998681563687323cc496222d2609e3 SHA-256: 86e2191b63e185bde9655508b9d00e9066f6075a5e5e129fe6428cb2226480b8
182 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as "free Robux" or "game hacks". The document contains a large number of external links, many pointing to PDF files hosted on nara.org.uk, suggesting a link farm or SEO poisoning tactic. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious campaign, likely involving exploitation or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-without-any-verification-game-hack PDF link annotation
    • https://www.nara.org.uk/uploads/files/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/client-minecraft_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE7 25752 bytes
SHA-256: f15dd3abf77135628656bfa1e86359d3b1c9c43ec3c1ff8f743367fcb431e3ad
font_01_sfnt_off000085f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F5 19144 bytes
SHA-256: f37955fcb4845292a10cf385cf7825d095aa25907e4328d2f78dbaed4e94b6f7

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