Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cafbec8a133d45b…

MALICIOUS

PDF

45.6 KB Created: 2021-05-15 01:04:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 962db15ef8cf2e172ac12b87899e344f SHA-1: d1023d6e1f02b3c5d973cf18a19ed9d736bd070b SHA-256: 3cafbec8a133d45b512bbf4266a1b06ab3da0a45160d856a31fdabb585cc57b4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users with promises of free game items and hacks, directing them to a known malicious redirector. The document body and embedded links suggest a phishing or scam attempt, likely to lead to further malware download or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/i-got-hacked-on-roblox-game-hack In PDF document text
    • http://seniornetwanganui.org.nz/images/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/roblox-free-robux-no-human-verification_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_off00004b43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B43 25656 bytes
SHA-256: 144c9129ed9842b8786765918dc15d09d03ffcdec51ea8025a50b7ba872535a2
font_01_sfnt_off0000850b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBD 18460 bytes
SHA-256: a8a49c36ef4b2531a5f792820ad3efe99a39c3e474aae1f279e7d577006455a1

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