Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ba3854b1372cea…

MALICIOUS

PDF

44.8 KB Created: 2021-05-16 17:33:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c5cc5c8d85beb5f107cf455bcadd623 SHA-1: 0e41cfd65d7c4754e8e44d33dc838cffdc495efb SHA-256: d1ba3854b1372ceaa85810aeb48bee1d18f8a9a04db5ad000915a3199e59059c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a malicious domain, identified as a known malicious redirector. The document body text, though partially garbled, suggests a lure related to game hacks and generators, aligning with the heuristic findings. The primary malicious activity observed is the redirection to the URL https://netcdn.xyz/app/406889139/hack-coin-master-mod-apk-game-hack, which likely serves as a gateway to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/406889139/hack-coin-master-mod-apk-game-hack In PDF document text
    • http://proyetec.com.co/aym_image/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/block-best-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/robux-cheat_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/coin-master-hack-pc-free_GM406889139.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_off00004998.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4998 25376 bytes
SHA-256: a41fc38e59645f82abefbdf5f6c1d9e2d2e30a844ab34518c91f50f95d53418c
font_01_sfnt_off00008335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8335 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE7 18068 bytes
SHA-256: cdfa184cf4df5ccff7f0e1b489f52066f139e51d3d41ad4e2547d55c8bfcf365

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