Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a12e88e4a9d867…

MALICIOUS

PDF

42.6 KB Created: 2021-05-21 06:43:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 97d27e4860fc2dc6f174020f1d278f69 SHA-1: 97d40d94a37182d59a9c8261f160dcd5289f8772 SHA-256: 57a12e88e4a9d8679fc9922379a9de82e1eb74a75cc9fef6fd85d882553f9b5d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure for 'Free Robux Without Verification 2021' and 'game hack' which links to known malicious redirector infrastructure. The document body, though partially corrupted, contains text consistent with this lure. The primary malicious IOC is the redirector URL, which is used to funnel victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0124

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-without-verification-2021-game-hack In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002b17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B17 28460 bytes
SHA-256: e3004d9f734fbb68ea66dc4abe631221840bd4cd03d9eb12092423228cc9fcdf
font_01_sfnt_off00006b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2B 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000074d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D6 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off000081e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E8 19368 bytes
SHA-256: a82984a519d7edf94c6531cfcf7f8df3cbe602e214b877051ae5dee029c294bf

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