Malicious PDF — malware analysis report

Static analysis result for SHA-256 c858a6128a75149f…

MALICIOUS

PDF

52.6 KB Created: 2021-06-07 04:05:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 985ef1eac61f01be5654a00c92a5a4db SHA-1: d75fa62acfd5c24f775ae1d52f2d2c23b24ec2b9 SHA-256: c858a6128a75149fb36c3a99cc2f2a8ce86ae63710345ed30c80e99357156ac4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links and a fake CAPTCHA lure, strongly suggesting an attempt to trick users into visiting malicious websites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a link farm and SEO-optimized PDF links indicates a potential scam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/roblox-cheat-engine-fun-commands-game-hack PDF link annotation
    • http://www.pspmrsmlangkawi.com/opac/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmlangkawi.com/opac/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DE 27464 bytes
SHA-256: 504501a81b36d08e09c3e4e451a2e0ffc0b24a8b1d9846e809ec813922cf31e2
font_01_sfnt_off000090d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D5 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7F 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA791 19428 bytes
SHA-256: 8ad31466d1d44a1ca8f978e8fde8218d86f5b82cde38fd958513f5e85af391ad

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