Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0b16586c73027b…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 19:03:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ef7d8b2265830814aef1cd48627bccc SHA-1: 7d6f8f939f9d426cffbb6d0cda1aa85b62b4d617 SHA-256: ea0b16586c73027b165965854800ef74ae8c4c94dcb1d710ceac89e7eb741b25
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on "free generator / game hack" lures. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/www-free-robux-game-hack In PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-designs-for-streamers-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-1-click_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-gun-script-hack-r15_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/pokemon-go-free-stuff-codes_GM1094591345.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.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
font_00_sfnt_off00002da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA2 22164 bytes
SHA-256: 470ba97e9a1fbca9cf1fd5794310f405e22444a340e4abbeb6a8f336a6aa0082
font_01_sfnt_off00005ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA5 19080 bytes
SHA-256: acf5ca21e1b57f7804790e88d3c8e797014eccbd964a564fa6b8ab1e1ef3ee82

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