Malicious PDF — malware analysis report

Static analysis result for SHA-256 916ab5e7687fdfd8…

MALICIOUS

PDF

46.3 KB Created: 2021-06-04 04:23:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b768d5cad26b672ee0c5d0094af7cb4f SHA-1: 6027b8b419627f98ed6829f203d98626ed034472 SHA-256: 916ab5e7687fdfd80de4572cdcde952af93c2dc52571f5b6bde54ca974af767f
82 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are algorithmically generated and point to potentially malicious PDF files. The document body and extracted URLs suggest a lure for game-related cheats or hacks, which is a common tactic for distributing malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • 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.online/app/406889139/coin-master-free-coins-and-spins-2021-game-hack PDF link annotation
    • http://katalog.stikesmukla.ac.id/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/wurst_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-spin_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-roblox-legaly_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-coin-and-spin-app_GM406889139.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_off000050bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BF 24188 bytes
SHA-256: 2f3baabe7274e4c775bf8c2a3a817b6968fe406c80c8f4f2e9878590e4ae49c2
font_01_sfnt_off000087ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000915e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915E 18460 bytes
SHA-256: 9b9248072d2421e664493d6d5ab14406474bc62db1d786ff94b6c1680f0f8261

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