Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc36df3cd4fe49d…

MALICIOUS

PDF

44.8 KB Created: 2021-05-11 00:30:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d5ba98f698af9d4e5c2f1e9caa03ee38 SHA-1: 49219d4597653f995bc6c655adfe4cf22a5f9d6e SHA-256: 4cc36df3cd4fe49dd126a214b94f8b79e148ace9ea5b152f4854d1462f1f1558
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of providing game hacks and free resources. The document body and extracted URLs suggest a lure for users interested in games like Coin Master and Roblox, likely to drive traffic to SEO-optimized PDF link farms or potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coin-master-free-spins-2021-game-hack In PDF document text
    • http://librarystkippgribl.com/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D6 25340 bytes
SHA-256: 3e740955631694a978a47d9469c4db8e386d49e2c5cfe54fbb7f5e173389f14b
font_01_sfnt_off0000828e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828E 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871

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