Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7849a6d7ad9f7d…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 06:05:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 694728b5184850b6301d7e8b002b0552 SHA-1: b54ce14d72ef82f0e3c41744fc32023e2623e600 SHA-256: ff7849a6d7ad9f7d2cd415828df17bf93e703e0c0bd674c78355dc40616d32ee
102 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content distribution scheme. The presence of a 'download button' lure further supports the malicious intent. While no scripts were extracted, the ML classifier and heuristic firings indicate a high likelihood of malicious activity, possibly leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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.tw/app/431946152/roblox-jailbreak-game-for-free-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.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_off00005266.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5266 26372 bytes
SHA-256: 6f100d435b0178afe5bd153ac17bb163564f11702019105284ac7fefabc61852
font_01_sfnt_off00009014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9014 18892 bytes
SHA-256: d0c87588116f14bd04af138a3b5ebca2275c55b5dc899bd722be4a957ec4491d

Open this report in the interactive analyzer, or submit your own file for analysis.