Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca375e8d7ad6434…

MALICIOUS

PDF

34.3 KB Created: 2021-07-07 06:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 20a253858ec0cb66b041d2fa8f3ddbd3 SHA-1: 0fa7e2e5b32c74b0baf70deee9d6ee44d88652d9 SHA-256: 5ca375e8d7ad6434e6b01895d6a2332344fa40093d6c5dc84f3a93e4637934dc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector infrastructure, specifically advertising free game currency generators. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. The document body also contains the primary malicious URL, indicating a phishing or scam attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-no-verify-game-hack In PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/hoodie-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/best-free-software-to-make-thumnails-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/arrest-me-and-get-free-robux-roblox-jailbreak-roblox-live_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-hack-to-get-robux_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_off00002e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E63 22560 bytes
SHA-256: f3fc59885ca992a3f51b592d7e87321e61a3bdad5ea4b45c817f0ae712014609
font_01_sfnt_off000060c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 19148 bytes
SHA-256: c82ca362f7929c521a15e373c099d5f63e765e94f5114feac3ee2b66231d0241

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