Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f5916aaacb8cee…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 19:15:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 629fb27cf924aab1ab0f650f39ee121c SHA-1: 567965e7f02a07488382dec8159694b5ebf6e260 SHA-256: 64f5916aaacb8ceeef812b8d09eb0f4196122452b118e05b4545df3e2c6dd480
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical redirector link to 'netcdn.tw', which is associated with malicious activity. The document body and heuristics indicate a lure for game hacks and generators, suggesting an attempt to trick users into visiting malicious sites or downloading unwanted software. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-ios-download-2021-game-hack In PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-generator-no-password-required_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/hack-alle-pets-duplizieren-ninja-legends-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-hack-synapse_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/goblin-v1-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/hello-neighbor-free-play-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/cheat-in-roblox-jailbreak-glitches_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/how-to-get-admin-commands-on-roblox-by-hacking_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/hack-of-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/get-free-roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/clicksfly-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-copy-and-paste-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-generator-no-human-verification-2021-ios_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
font_00_sfnt_off0000328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328C 22948 bytes
SHA-256: 72f4641ec592ca7361fa46e38519484881f9b0515c1cd82b9d3674c0b7c3bd8e
font_01_sfnt_off000065d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 18988 bytes
SHA-256: 38bdadb1b7da090961c2708b1aa06733b48bbb3bf7ce9cd8d7895abf65638cbc

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