Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26bca08da13952…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 22:14:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 773b97f98f2fcee0028482c84e04a937 SHA-1: 84fc9ffa6bd2ac1a05ba5e82f4b0634ed0d6beb4 SHA-256: 3c26bca08da139529c7cb7e35b1de156c3c58f9f1cbe75519cffa76834ad3526
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, specifically advertising a 'Coin Master Hack Online 2021'. The document body, though heavily obfuscated, contains the same URL. This indicates a phishing attempt designed to lure users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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.online/app/406889139/coin-master-hack-online-2021-game-hack In PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/pokemon-go-free-gyarados_GM1094591345.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/wurst-client_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/apps-for-free-robux_GM431946152.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_off00004fdd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDD 24668 bytes
SHA-256: 9ba717597136d4e75445b298b668373a212b0b36c206b62a4fc990e78a2f9183
font_01_sfnt_off00008757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8757 2920 bytes
SHA-256: 64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff
font_02_sfnt_off00009173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9173 18192 bytes
SHA-256: ec8cb6d56d0df2adcfe0c2b29b17454d13f1615f522836c6e7b582aab5d03dc6

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