Malicious PDF — malware analysis report

Static analysis result for SHA-256 978c369b8ca46ab6…

MALICIOUS

PDF

36.5 KB Created: 2021-05-23 00:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ea6277a44ceab3cdf8a5fd35e45c8d0d SHA-1: 7931992e48278a6b54653a67855fa0d2157d5c3e SHA-256: 978c369b8ca46ab63d0fcd7d86b829858380f3d77cbca0c1b987bbcab37c8e26
160 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering 'free Robux generators' and 'game hacks', which are common lures for phishing or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure. The document body also contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. While no scripts were explicitly extracted, the nature of the lures and the presence of redirector links strongly indicate a malicious workflow aimed at tricking users into visiting compromised sites.

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/free-robux-generator-no-human-verification-game-hack In PDF document text
    • http://deyuan-pc.com.tw/images/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-100-robux_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000331d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331D 24936 bytes
SHA-256: 01085fe58dcbcb07dcd757f6afe5da2d4111978c371cfb4ccefa06a1ca7e1770
font_01_sfnt_off00006bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDA 18860 bytes
SHA-256: f1337887e63f46ec65b145f76804780e669468724c6330ac6fa0452b843b30d3

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