Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7d9a4897b8a764…

MALICIOUS

PDF

36.8 KB Created: 2021-05-11 22:00:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c9976300d6d1f3637d43f5e3244918f0 SHA-1: 43123d85066aefa6ab7358099d296f6e56092e15 SHA-256: 0a7d9a4897b8a7647b21e79e82605ae35b2c194528259e3d6a748140721138b1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The ML classifier strongly indicated maliciousness, and the embedded URLs are associated with known redirectors. The document body and embedded URLs suggest a social engineering lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-roblox-game-hack In PDF document text
    • http://yochin.org.tw/images/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-minecraft-pe_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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004813.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4813 26120 bytes
SHA-256: f27cdf0248437dadcc3cc84518b518c691eaa544a394c30a47bd6b0abb1ceb2b

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