Malicious PDF — malware analysis report

Static analysis result for SHA-256 168890c3df10ac70…

MALICIOUS

PDF

44.2 KB Created: 2021-05-15 03:22:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7a249429434cc314b7e07afd2b31f373 SHA-1: 764a5589b999fc37dce8ab21da5690eab91e9f13 SHA-256: 168890c3df10ac705679ab564bd737bb26d7ff2d8def39a711c9ce16113d7220
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to external PDF files hosted on 'iedarelief.us', suggesting a link farm designed to attract traffic. One prominent URL, 'https://netcdn.xyz/app/406889139/android-coin-master-3.4.33-apk-hack-game-hack', is flagged as a malicious redirector. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/android-coin-master-3.4.33-apk-hack-game-hack In PDF document text
    • http://iedarelief.us/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/robux-hack_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-hack-apk-facebook-login_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_003_off00004af2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF2 23424 bytes
SHA-256: 303b03ab70a9af874c8e3dc62a7beb4ea09e25cb038d20b020f347dc4de3fa16
font_01_sfnt_off0000803f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803F 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off000089e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E1 18368 bytes
SHA-256: 2f065b262c90889b0791dea6979f9c4554e2b44db1fd5e7dc87a2220bb7dab5c

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