Malicious PDF — malware analysis report

Static analysis result for SHA-256 1035468e5b9435f5…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 08:07:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4b4fa7da544a644e4801de30fef5f785 SHA-1: 6bb66fc3eebc3434339427cf641cff33ed4420b7 SHA-256: 1035468e5b9435f5ea7ef2734d37c609022ae5f5fb4d90fca1d186258cd42b63
260 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and a link farm, masquerading as a 'free generator / game hack'. The document body and heuristics indicate a lure to download further content or visit malicious sites. The presence of a security bypass instruction further supports malicious intent, suggesting the sample aims to trick users into disabling defenses before executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 https://netcdn.online/app/431946152/free-robux-codes-no-human-verification-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/isle-how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-pe_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coun-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/earn-rbx_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-hack-2021-download_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
stream_004_off0000539d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539D 27432 bytes
SHA-256: 28a25a7fa1f41bc6380c108418412ab3a00be3878566fbef7fb88e3bb5f91a38
font_01_sfnt_off00009347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9347 19032 bytes
SHA-256: 7535c842b13f5ab09a8d1f6df205e44a1f60a7fdf3d88b4466f5e7b4ed5bfe6e

Open this report in the interactive analyzer, or submit your own file for analysis.