Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d0e41fdc1dbb5b…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 21:59:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b07d63097383be22d6e484b4c4367dac SHA-1: 4de60e093d87960bc499ec596f7c5dc9ca59335e SHA-256: e1d0e41fdc1dbb5bd39d7c02947a0f96c8940d640df5808b9f2bbb6e25a3fd69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains links that redirect to malicious infrastructure, specifically advertising 'free Robux' or game hacks. The primary malicious URL identified is http://netcdn.tw/app/431946152/rbxcity-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to lure users to potentially harmful websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/rbxcity-free-robux-game-hack In PDF document text
    • https://library.um-sorong.ac.id/repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-free-robux-2021-not-patched-mac_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-dinosaur-simulator-hack_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-hack-computers-in-flee-the-facility-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-eye-poppers-free-hack_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/longshot-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-roblox-pins-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-free-robux-codes-2021_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_off00002fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE1 21952 bytes
SHA-256: 71354dd674bc9b28e89a0e633888a9e2811e1f8c71447abd1a4dc8cb97482b3e
font_01_sfnt_off0000605d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605D 19120 bytes
SHA-256: 907f950e015ca7f55d34c04d668a41be98fd0850b0b9f22eb15d2dc956c9f495

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