Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb51b7de33b2dcc6…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 12:37:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7ac77d0fb9bfea0df8638387339148fc SHA-1: 2a3596036bc66d1ffc6c207c5b89ba001ea61c5d SHA-256: eb51b7de33b2dcc6aa9a724d89b9a73368a78758f613604c721961138ee4b5e6
160 Risk Score

Malware Insights

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

The PDF contains a lure for free in-game currency, directing users to a known malicious redirector URL. This suggests a phishing or scam attempt designed to lead users to potentially harmful content or further malware. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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-free-coins-and-spins-app-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/robux-match_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-minecraft-accounts-2021_GM479516143.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_off0000506c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x506C 25532 bytes
SHA-256: 72b2ddd6a9ad46bc8baf9230314dfe255472e5438f6a4e2955e91c12b77eaf09
font_01_sfnt_off00008c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1E 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9747 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb

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