Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee40d211683e759…

MALICIOUS

PDF

34.6 KB Created: 2021-06-24 22:40:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: beb7fa9e9d6c123f5a322ae5d35b459c SHA-1: 5888025a2bbf71ad08cea08412412c3987142799 SHA-256: aee40d211683e7593733f2186392ce2855668e4d33238d2af9d37e000ef5fdd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency or hacks, directing users to a URL associated with malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the document body confirms the lure. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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.co/app/431946152/how-to-get-a-lot-of-robux-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-speed-hack-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-offer-wall_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-tix-roblox-no-survey_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/comment-avoir-robux-gratuit-2021-sur-pc-facilement-free_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-in-roblox-june-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/100-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-sweatshirt_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/i-got-hacked-on-roblox_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_off000030b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B4 22404 bytes
SHA-256: 434a0794b229e86ac74d341ea247c4a9196c9e8de034b30da83d7803147ddb3d
font_01_sfnt_off00006282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6282 18820 bytes
SHA-256: cdc6a2a788e7d1c038814bd34757d45de3c8708b5dd2a0e8e1b59012f3bb2d4a

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