Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57ec4eb2ab323de…

MALICIOUS

PDF

42.5 KB Created: 2021-05-10 23:08:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 22ea1c261fb621006640848fa4880bf4 SHA-1: f8a95462ff55b1cc869ef888195ed2632d031b21 SHA-256: e57ec4eb2ab323dec2bd8bfe7565be7bfd0d58dbdc4d57adbcffe3dc267fd988
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free generators. The embedded links likely lead to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-game-hacks-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacks-para-roblox_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
stream_003_off0000499a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499A 26220 bytes
SHA-256: 998051d235ffb548cc4a7ccc69a5fc930f1a2dde7a379531f547b4d0b24313f1
font_01_sfnt_off000084c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C1 17976 bytes
SHA-256: 4c1d26c1fb4feed8092d99a8761960172faa49b0c213e7324f16c91828cd6f14

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