Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a151ea933d4a57…

MALICIOUS

PDF

39.6 KB Created: 2021-05-23 13:04:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b28e888f5f5ef246507b7b67e97e31a9 SHA-1: abf13cf229ae4db8aac90403d5e392c43a95d798 SHA-256: c1a151ea933d4a572d08b945d10dce6c5e92c65b14f06a36af112312e5b76b6d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, leading to a "free Robux generator" lure. The document also displays a fake CAPTCHA, intended to trick users into interacting with the malicious content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 5

  • 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.
  • 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
  • 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/431946152/free-robux-giveaway-game-hack In PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-generator-2021_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
stream_002_off00003498.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3498 29688 bytes
SHA-256: b8c2f741a637ed08a36f9d8e01c91be25395887ea7a99ed71837567e509edd69
font_01_sfnt_off00007823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7823 18820 bytes
SHA-256: a907981f6338d23acda294c558170907db38f399f16fdb2ca0bc536a0b707f6d

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