Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dc5351b51595cf…

MALICIOUS

PDF

32.3 KB Created: 2021-07-04 11:18:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b29de3d3d121df10b149ba0e5c9ff7c SHA-1: 6c2e480e48e8573458e5bdbc26a1efde990b3535 SHA-256: a6dc5351b51595cfd6b49d9a1979623bf0bf1042a572a5ac3b049f268cbc61e5
168 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and links to known malicious redirector infrastructure. The document body and heuristics indicate a lure for virtual currency, specifically 'Robux', by directing users to a site that promises a 'ROBUX GENERATOR'. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability to execute further malicious actions. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/blox-land-free-robux-game-hack In PDF document text
    • https://sundae.co.th/js/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-roblox-murder_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-on-pc-october-24th-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-hack-no-download-or-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-boombox-highschool-2-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-minecraft-skin-packs_GM479516143.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_off00002a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A56 21560 bytes
SHA-256: 3c94c9ffee757a38e91dcbd2aa1bd48a88b52a85111531bc5c780503eb3a8948
font_01_sfnt_off00005985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5985 18964 bytes
SHA-256: 3f12ef93e3f94e19068a8415642f40f3a4d95b4d38f37f1bdada02c05cec8b59

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