Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51acc50c20ad47c…

MALICIOUS

PDF

51.1 KB Created: 2021-05-12 00:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ca80558fae0321df85b3ba78a30ec16 SHA-1: 4c0001d4daa589a1c0a14603852d0e6d4d7453e1 SHA-256: e51acc50c20ad47c09e126b78c0c757010d0ca4d81820cb18c930791097a0ca8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirectors, specifically promoting 'free generators' and 'game hacks' for popular games. The primary malicious link identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-uk-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users into clicking these malicious URLs, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

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/coin-master-free-spins-uk-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/robux-money_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coun-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE5 27012 bytes
SHA-256: 4c0f517bf62fe5a7a6479dc33f2b09c5c801b8fdb8d70e8093e28c51f394d39f
font_01_sfnt_off00008a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5E 5272 bytes
SHA-256: 150955d7eacf53775e9b58886286d6a68f3b71dd575ca7400e2f21e2b90cd8db
font_02_sfnt_off00009b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B98 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA587 18240 bytes
SHA-256: aaae38b64eb30a0fe4220b35513ba1ff9605c019ef2dc3651a924d8ad355a85d

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