Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9cd4961aa96f31…

MALICIOUS

PDF

39.9 KB Created: 2021-05-22 18:28:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0e7fa9799277ad9d04613ce695fcf192 SHA-1: a1783bde9e5340c31ce33940e343ee7d1d3f908f SHA-256: aa9cd4961aa96f312da8fa447e3c6a0a8cb9f9d12442bfc985ce25c693917fd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of 'free Robux' or 'game hacks'. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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/free-robux-codes-no-verification-game-hack In PDF document text
    • http://inextpresident.com/images/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://inextpresident.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://inextpresident.com/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://inextpresident.com/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://inextpresident.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://wolfzscriptsIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000346b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x346B 25284 bytes
SHA-256: a26e5e7fbac877eb62ddb1659951e358f709a36b91aa1d6988f5ab57ec569aca
font_01_sfnt_off00006f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F31 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000078e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E2 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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