Malicious PDF — malware analysis report

Static analysis result for SHA-256 b213847251437d1c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-22 00:14:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f166b554e12f6c9b4d08c5ae529b857 SHA-1: abc32ca1c6dadfd2f277bc3049c06349de468e13 SHA-256: b213847251437d1ccd63b6191197a0078460e0b6171376811d99674b493efd4b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator" or "game hack" lures. The document body and heuristics indicate a clear intent to trick the user into clicking these links, which likely lead to further malicious content or downloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://netcdn.tw/app/406889139/free-spins-for-coin-master-app-game-hack In PDF document text
    • http://spentulib.com/search/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/haktuts-coin-master-free-spin-link_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002ffa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FFA 23272 bytes
SHA-256: 1bed9173b75439fc8f783887fc86184b6751a5c76750c9bdce5ee894600d00f8
font_01_sfnt_off00006491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 17884 bytes
SHA-256: c0e07e045f0496ba68af439e810d5bb13e23b0d850ef9426c095223eaa712aa7

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