Malicious PDF — malware analysis report

Static analysis result for SHA-256 19425624791d37b6…

MALICIOUS

PDF

36.5 KB Created: 2021-05-21 07:35:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 70e7466fc8ab6801fd0a64c6f9c4d681 SHA-1: 82865d682d29065207f2c834f8579a14b405f02d SHA-256: 19425624791d37b6f0d5af9500b3bf9e6c2476baf95dd79a771007714a7c19bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The document body also contains a call-to-action phrase and embedded URLs that lead to these malicious sites. The primary goal appears to be directing users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/free-minecraft-thumbnails-game-hack In PDF document text
    • http://businessfit.com/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/free-robux-gift-card_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_off0000356b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x356B 24600 bytes
SHA-256: bcff48dc36cf47c692b2687bf4ab59f0834144c56a7d3dad0bce3da1bc769c56
font_01_sfnt_off00006d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D94 18368 bytes
SHA-256: 85a02e6fcaecceb391bd1a2e9ef36225352b9e1f533fa420e6bae34b60a7da86

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