Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a64d844d870d10…

MALICIOUS

PDF

43.2 KB Created: 2021-05-19 20:28:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1a92e946778d1da4a7e087df4db3ade1 SHA-1: a9fec6cd5ce24525aa76b39313104a2f307b8ee3 SHA-256: a1a64d844d870d10bd7ecb000ecbc0b403baa09dc605feacd229c7b8fd4f37c9
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into performing an action that likely leads to a malicious download. The embedded URL points to a resource that is likely a second-stage payload. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 4

  • 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.xyz/app/406889139/cm-free-spins-game-hack PDF link annotation
    • http://elearnfactory.com/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://elearnfactory.com/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearnfactory.com/images/how-to-hack-and-get-free-robux_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_off000046c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C9 24644 bytes
SHA-256: 0a1362d81d78627de3d39ca7aa2f4a8355e95dfb4529b5fb8de1ee6950945e0c
font_01_sfnt_off00007ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA5 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8848 17672 bytes
SHA-256: c7edaacf3d8891068ee17a427980e4b8712b9880538c2e482dce739b11255869

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