Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3797474676e475…

MALICIOUS

PDF

35.5 KB Created: 2021-07-01 05:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f868166cea12d949835988212d532b7 SHA-1: 23a8a623f3e45b47210b727b9c1652ff8b3dc4f7 SHA-256: 4c3797474676e47582f3aafa41ef09952c70e4ce22c4d57e370467d97dfaea55
160 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free currency to entice users to click on embedded links. The primary link directs to a known malicious redirector infrastructure, suggesting the document's purpose is to lead users to potentially malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.co/app/431946152/roblox-cheat-level-200-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-email-cheat_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/get-free-hero-animation-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-robux-for-free-without-builders-club_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-hack-little-obby-studios_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/notoriety-hack-script-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/pubg-uc-voucher_GM1330123889.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-roblox-badge_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-hairstyles-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-hack-prison-life-download_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-download-play-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-fly-hack_GM479516143.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
stream_002_off00003108.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3108 23288 bytes
SHA-256: 7163764104fa087ef646a595407b93a9bf7e785dc5d2720901dfc89028895300
font_01_sfnt_off00006555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 19168 bytes
SHA-256: 317f9514a3fe7762be07a3997133b689696c2716de5df7d849300b8b6a91056e

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