Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15ef5875a19dca6…

MALICIOUS

PDF

42.9 KB Created: 2021-05-19 05:30:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a5e3c1f85e39c146d1558597bf387eb9 SHA-1: 5b645b4b6a18f148ee9ce994283ee450c045828b SHA-256: a15ef5875a19dca6aba681cb8b3a4a004b53d3524e3a970d381c1ad0394ad5d8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, masquerading as game hacks and free generators. The document body and embedded links suggest a lure for free Robux or game cheats, which is a common social engineering tactic. The presence of numerous external PDF links further indicates a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-site-game-hack In PDF document text
    • https://ezgolfer.com.tw/image/data/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/robux-survey_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_off00004af6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF6 25764 bytes
SHA-256: bb24280e25fa4ecfa5f46995788e74b5319acf337372f8da0124b35c6db63858
font_01_sfnt_off00008589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8589 18236 bytes
SHA-256: d17cd47be652198dd65b1182653c5b68eec39c9a25c2fe205f68dda680ae7be3

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