Malicious PDF — malware analysis report

Static analysis result for SHA-256 021f615d3deb46b0…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 12:16:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b67c367f148d0c628ac9abb0581f04ad SHA-1: d93cecc8759e71d7523edb842b153eb79501204d SHA-256: 021f615d3deb46b063bf08856205c6bdaad0a28e1bb71d0809669576cbe7c762
180 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector disguised as a 'free generator / game hack'. This lure is intended to trick users into visiting the malicious site, likely to download further malware or engage in phishing. The malformed stream length heuristic and ML classifier further indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-sites-2021-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-name-change-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-roblox-arsenal_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-robux-into-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-exotics-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/youtube-have-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-weird_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-cafe-groups-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-hack-download-mac_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-dominus-roblox-event_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-jail-break_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-mad-city-free-car-glitch_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-spin-link_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
font_00_sfnt_off0000301d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301D 21796 bytes
SHA-256: 67f4ed3e357d35cdb126d06da2d4f53b34fc9c3264af617000684dbfddd9bf54
font_01_sfnt_off00006049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6049 19340 bytes
SHA-256: bf872f38d37b2489c3690af0fb3a59d21ccad535cade2ac40decd632f59a44ea

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