Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3d4d6d36f2ab9e…

MALICIOUS

PDF

42.4 KB Created: 2021-05-14 16:36:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8e30f2b50b7c10811dc32bc4ca0ca2f7 SHA-1: 4c98a4ab7e917144be76ab286b2d88539956ff08 SHA-256: 1a3d4d6d36f2ab9e04b690ebf1166115c014c58e897d025b08b0a45400825d63
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and SEO link farms, all promoting game-related cheats and currency. The document body, though obfuscated, contains references to 'Robux Redeem' and includes URLs that are likely part of a phishing or malware distribution scheme. The presence of a 'password-protected archive handoff' heuristic suggests that the user might be prompted to download a password-protected file, which is a common tactic to evade security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/robux-redeem-game-hack In PDF document text
    • http://kontaktadig.se/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-hack-roblox-to-get-robux_GM431946152.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_003_off00004742.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4742 26032 bytes
SHA-256: 93ae1fc2fb7b34bfffe6ce72d6d990d6532b8254fcca57a87f00071e05087972
font_01_sfnt_off00008372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8372 18284 bytes
SHA-256: 44dc1e2cf684a6e0cb1a9975d010cf8d82021a8fc0e8862ab9775ffa9cb00637

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