Malicious PDF — malware analysis report

Static analysis result for SHA-256 515bb831376e232a…

MALICIOUS

PDF

41.1 KB Created: 2021-05-23 09:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: df3dfb0643cee3e65b81941c5b095f66 SHA-1: 71b1bacb0a9734bf11641b33b1a827d138a1e51c SHA-256: 515bb831376e232a5cb46db6f9c2e20ec9c42b07d76809830d90816c81618151
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free Robux' or 'game hacks'. The primary lure URL is https://netcdn.xyz/app/431946152/how-can-you-get-free-robux-game-hack, which is flagged as a malicious redirector. The document body and embedded artifacts suggest a social engineering tactic to trick users into visiting these malicious sites, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7407

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/how-can-you-get-free-robux-game-hack In PDF document text
    • https://pemadamapi.net/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://pemadamapi.net/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://pemadamapi.net/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pemadamapi.net/images/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • https://pemadamapi.net/images/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn 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_off000033e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E6 27336 bytes
SHA-256: 38946dcef2a1d78e6f56e5637ff715e66facd38e135275ea97e506738d01fd16
font_01_sfnt_off000070e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E3 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF4 18672 bytes
SHA-256: b25769fe22a84510cbe545ecc77c61068e90e31ebb29fb78564d629eaf3a10b0

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