Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d623d0b8c833bd…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 23:07:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c20e681d2ed576430f012bf920e62d39 SHA-1: 0608863dfdb73efdd4ada373baaaf5b23e9e9c60 SHA-256: 20d623d0b8c833bde2c3cb1b917610b2f0b3f922cb9025a9346588787bbc2b3d
160 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users into clicking on what appears to be a game hack or generator. These links redirect to malicious infrastructure, specifically `https://netcdn.xyz/app/431946152/how-to-get-free-robux-game-hack`, which is flagged as a malicious redirector. The document body and embedded URLs reinforce this lure by mentioning free Robux and game hacks. 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/431946152/how-to-get-free-robux-game-hack In PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-games-download-free_GM406889139.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_off00004781.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4781 26716 bytes
SHA-256: 629be29497d8644ccae52f5c2fc3eba86d7ea202340b78f86ae70c51c2a803a5
font_01_sfnt_off00008524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8524 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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