Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1a2a83fd20c46f…

MALICIOUS

PDF

42.3 KB Created: 2021-05-10 20:37:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 85be15110436e81dfe0cacc0aea39d98 SHA-1: 3eb9e1041748fb714df039d6bec266c9c8c9ef3c SHA-256: 7a1a2a83fd20c46f041eb94bbeaef5347d29019c742ffe68606ab49ec74bc00c
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO manipulation or to host malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially harmful content, aligning with a phishing or content-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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-free-coins-spins-game-hack
    • http://digilib.stimata.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/roblox-download-pc-free_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/free-coin-master-spin-app_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://digilib.stimata.ac.id/repository/coin-master-hack-ios-apk_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/minecraft-download-free-download_GM479516143.pdf
    • http://digilib.stimata.ac.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/free-daily-spins-from-coin-master_GM406889139.pdf
    • http://digilib.stimata.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/no-human-verification_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • http://digilib.stimata.ac.id/repository/free-robux-gift-card_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/robux-money_GM431946152.pdf
    • http://digilib.stimata.ac.id/repository/coin-master-free-soins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c06.bin
2f1ad494b78e0e66864accdc58c1f713ef7498c944fabc2675cb63b24534c82d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C06 24484 bytes
font_01_sfnt_off00008419.bin
7b855ef2bb944b5b370c61480927ccad63ff31bdbf820bc1f0da9d35a10f5fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 17884 bytes

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