Malicious PDF — malware analysis report

Static analysis result for SHA-256 131e63ffa0a3d3db…

MALICIOUS

PDF

47.2 KB Created: 2021-05-19 22:36:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a82c3b34cdc6f180f0ec76028e130807 SHA-1: 6bc9906357d21f51eda9dd586b3917e59b3428ac SHA-256: 131e63ffa0a3d3dbd9053e48010dcf1a2cecb23ef629269706d73ef119dcb72f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game-related hacks and free currency generators. The links redirect to known malicious infrastructure and a large number of other PDF documents, suggesting a link farm or redirection scheme. The document's primary purpose appears to be driving traffic to these malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.
  • 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.
  • 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/roblox-avatar-com-game-hack In PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C7B 25788 bytes
SHA-256: df7adefd1ea7be10d26c7e3e6768b4cc16e111359f48f790ccda2f55a6e611a8
font_01_sfnt_off000088c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C3 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000956a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x956A 18492 bytes
SHA-256: 0bfbb41744fd3891f32c18381ea8358331ecc6352836a5a8663314898f67b625

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