Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51224cdebe4cb04…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 18:14:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b34613a8567d4022d79340f70304c01 SHA-1: 47256290c8c243954578dadf0545a5f86238b382 SHA-256: b51224cdebe4cb045dba37bbd219a26a9a6827772c29ff1d4c71cf143ba0632d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a malformed stream and links to known malicious redirector infrastructure. The primary lure is a "free Robux gift card" and "game hack" which directs users to the URL http://netcdn.tw/app/431946152/free-robux-gift-card-game-hack. The document body and embedded URLs suggest a social engineering attempt to trick users into visiting potentially harmful sites.

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-gift-card-game-hack In PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-generator-no-survey-or-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-coolkid-hack_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-get-free-stuff-on-the-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack-download-mobile_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/6-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-2021-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-roblox-accounts-robuxian_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-hack-client-pc-download-aimbot_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-hack-no-inspect-and-element-2021-not-patched_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/jailbreak-free-money-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-2021-cheat-hack_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-hack-jump-infinite_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319A 22220 bytes
SHA-256: 2bc746cab342d29b1b80151f47be5db85c57e0325c7406c2bf8bea5f4b7515aa
font_01_sfnt_off000062fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FA 19112 bytes
SHA-256: 5d60391c622a458b14b8fa69ffb952c1d3cbb56e74fa158a34f16b9612198a82

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