Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4454983636e44d…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 19:37:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 874bfe8173967b097366272dcfcc0271 SHA-1: a5b4bc62c466e42da25eac458b96e9271e4c1d96 SHA-256: cb4454983636e44d803f54d8c34cc4f35020242dc84cacb80e17cabed517123e
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and multiple links to known malicious redirectors, including one promising free Robux. The primary lure is a 'free generator / game hack' which redirects to http://netcdn.tw/app/431946152/free-robux-promo-codes-2021-game-hack. This indicates an attempt to exploit PDF vulnerabilities to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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-promo-codes-2021-game-hack In PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-real-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-spins-free-2021_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_off000032d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D1 22756 bytes
SHA-256: 5b05219010548bb2f31035d1d514323f7d6ca597cb7c834f5063a0001668b5b8
font_01_sfnt_off000065e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 19708 bytes
SHA-256: 4ffa5120539f8d9e821cc62be6a3cc920cc67344a1ea2f390d2f58e18d351055

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