Malicious PDF — malware analysis report

Static analysis result for SHA-256 5905feddaebc6371…

MALICIOUS

PDF

28.5 KB Created: 2021-07-19 12:19:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f7ecd86c1128448f6db8ecfb1105a9c5 SHA-1: 9d62254159bb00a6020606385ad422df8576a3e5 SHA-256: 5905feddaebc6371137ae6eb71b2b7ea88fdfd88834029310845e1aae2408583
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of free game items or hacks, ultimately redirecting to malicious infrastructure. The primary redirector URL is http://netcdn.tw/app/406889139/master-coin-free-spin-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 3

  • 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.
  • 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 http://netcdn.tw/app/406889139/master-coin-free-spin-game-hack In PDF document text
    • http://hk-kan.org/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://hk-kan.org/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/best-minecraft-hacked-client_GM479516143.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_off00002c72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C72 23812 bytes
SHA-256: 01bd2544c9d888fd4b82b837fa4bfb113e53bf7cff3566f883b58a5354053f28
font_01_sfnt_off0000627f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627F 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd

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