Malicious PDF — malware analysis report

Static analysis result for SHA-256 742aada4a83e91ac…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 04:53:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 21a2ffbc8c8a0129fb2a4378404ea361 SHA-1: 64d3ad58cc466674526f8729167c8f2f7f80b7fc SHA-256: 742aada4a83e91ac6aa1dbf4483d11f5ddb84276829a772a1768b11488868130
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising 'free Robux' and 'game hacks', which is a common lure for scams. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites that likely host further exploits or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.tw/app/431946152/free-robux-2021-game-hack In PDF document text
    • http://bibliodetki.ru/images/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://bibliodetki.ru/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-tiktok-followers-without-verification_GM835599320.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_off00002b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3D 22116 bytes
SHA-256: 4ef3408829fd6ce563f2a0913d69d64a65bd07ac105603e2bdeaa6a634e27556
font_01_sfnt_off00005c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C30 18600 bytes
SHA-256: a2c5ceeb34a0fdda65f6d16b67831e7179df071a1f7dc46648d6724acc442c88

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