Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefdfc89223fa10f…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 16:02:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 26c631e04b771d3cadbfa69e5ff65e65 SHA-1: feda66c945b77fb85060107d6c513009f88a3fa8 SHA-256: fefdfc89223fa10f1d6e3410f863977b19c9d7f001648dfc01bae0e15adcafcb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, masquerading as 'free generator / game hack' lures. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/free-robux-codes-2021-real-game-hack In PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-number_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-roblox-gift-card-codes-2021-september_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/pubg-uc-details_GM1330123889.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/get-free-robux-com_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_off0000312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312F 22668 bytes
SHA-256: 3733e6eb25e0b8b19be6b2227ba1a476bcd348104ceae9adcf3817dcd41ca2d2
font_01_sfnt_off000063ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 19364 bytes
SHA-256: 58b5540d62ffcbcd0cd09a8102d97fc092b94db7ea089f1030660d7870c6f7c3

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