Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f913b3afc6ae1d…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 11:23:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6032a72e372fec7b1e0e0feeaf1884a SHA-1: 09021159cbbe7563ff9d9cb8fc990945003b7f28 SHA-256: 52f913b3afc6ae1de476eb4a074440b5a24c072f450320bde6dbdbcfc9da7f8f
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting a phishing or malware distribution attempt. The content, including the document body and extracted URLs, focuses on lures for free in-game items and currency, indicating a social engineering tactic to entice users to click malicious links. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/is-minecraft-free-on-pc-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-on-pc-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-roblox-jailbreak-mode_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/landonrb-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-human-verification-no-survey-no-offer_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-do-you-send-a-roblox-fottage-of-someone-hacking_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-survey-only_GM431946152.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
font_00_sfnt_off0000331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331F 22824 bytes
SHA-256: 33c0f280ad3cf3068b1df1ecc275b6538e90864c961f1204f1f069b39993fea5
font_01_sfnt_off0000663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663A 18008 bytes
SHA-256: 62c66436bb3dd1aa34ea3ada0f014b29f352d4dd73dc7e13f71f1bd631277ac3

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