Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf8fac81abf5fda…

MALICIOUS

PDF

37.5 KB Created: 2021-05-21 04:01:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b51e9d81ab42f5b60ee1c6fba8c2881a SHA-1: 3802fe97725636045f35929fa73092becc02fbb7 SHA-256: aaf8fac81abf5fdaa92d1402b2c2bf84d32ccacd730731a719a81f0856dea414
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and hosts further malicious PDFs, all under the guise of providing free game hacks. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further stages of malware delivery or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/431946152/roblox-hair-for-free-game-hack In PDF document text
    • http://empresa-venta.hr/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-coins-and-spins-online-tool_GM406889139.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_off00003381.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3381 27020 bytes
SHA-256: 76a2fc491cf788fe8c8f2af8f4d2398548338ca1c147f1c16eea554f57646947
font_01_sfnt_off0000714f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714F 18296 bytes
SHA-256: 071abe11bc505b6fd5896db9ed6c4248165c6521bf389675a89e7515009c04ca

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