Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54e1c17cbf25a7f…

MALICIOUS

PDF

42.1 KB Created: 2021-05-17 23:40:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b925e3048d5387a3fdb4d5180c380da SHA-1: d2bc90ba3f0ba1ff9f777fa85c1c9fd564ca74b8 SHA-256: a54e1c17cbf25a7f5d6356f04e333c87d947333b0c6bdf81af6ca4fd7d770cc5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' or game hacks, identified as malicious redirectors. The document body and embedded URLs strongly suggest a lure for users interested in free in-game currency or cheats. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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/free-robux-card-codes-game-hack In PDF document text
    • http://knjiznica-oroslavje.hr/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-roblox-clothes-codes_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_off0000474d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x474D 25688 bytes
SHA-256: b9b81ff0dc0b5da020b2110189602bd62790c361ff856eaeaa8f4a82c0ed70e9
font_01_sfnt_off000081bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BD 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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