Malicious PDF — malware analysis report

Static analysis result for SHA-256 835777eadb8da3d4…

MALICIOUS

PDF

45.1 KB Created: 2021-05-12 06:39:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a19bf526301cca9f011549b456c5c789 SHA-1: 504ee1c386afd1684abaff9411844186335fae31 SHA-256: 835777eadb8da3d44415b6c940e2c7b7bf8767f05fc892ebde0f9e59ea49afe7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links, including one to a 'game hack' lure and many pointing to an IP address hosting more PDF files. The primary goal appears to be directing users to external resources, likely for phishing or to download further malware. The document's structure and content strongly suggest a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/406889139/coin-master-hack-link-2021-game-hack PDF link annotation
    • http://183.91.70.11/repository/free-robux-no-offers_GM431946152.pdfPDF link annotation
    • http://183.91.70.11/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-roblox-usernames-and-passwords_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_003_off00004b1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1B 24708 bytes
SHA-256: 284a25b053159584a9d3213e42c53e8eaa0f860c7e9a2671bfb10c2d661dd850
font_01_sfnt_off000083fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FE 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE4 18116 bytes
SHA-256: 25e00f41f2782f9bb0485ec3dace01d1d73ef8bc3473ddf3ed3584f1f3c729b7

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