Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cac2f3c20f1979e…

MALICIOUS

PDF

43.3 KB Created: 2021-05-11 15:12:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 45e954956f82252b64a91c65a758a3b6 SHA-1: 1d93089840640a785a319efd982088e94e9d4588 SHA-256: 1cac2f3c20f1979e54a194a0e0e142f565aad6d3548c27b44cab2ab0f538bdd0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free generators'. The primary link identified is https://netcdn.xyz/app/406889139/how-to-make-my-own-coin-master-cards-hack-game-hack. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of redirector links and a lure for free game items. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/how-to-make-my-own-coin-master-cards-hack-game-hack In PDF document text
    • http://stroygrad-spb.com/images/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/my-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C29 25396 bytes
SHA-256: a0e53b17d499b5b0185f89ff829d7df9c748cfa1315351146edde50526125c51
font_01_sfnt_off00008719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8719 18232 bytes
SHA-256: 5f1949bcf536834432a639d31c768e6b089f6f06eac6180dd684d59a3237e231

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