Malicious PDF — malware analysis report

Static analysis result for SHA-256 121c1fc4ec95fec0…

MALICIOUS

PDF

34.1 KB Created: 2021-06-30 09:43:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c84a7e2bd358b52cde47111ddf66a571 SHA-1: 6b0c3d10a40109ee4ce722b3af8a43db384ff255 SHA-256: 121c1fc4ec95fec0f0c18da792eb9b5232335a621942a509d17a1eba52be2ca8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites that appear to be part of a link farm, designed to lure users with promises of free in-game currency. One prominent link directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document's content and structure strongly indicate a social engineering tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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/how-to-get-free-robux-in-roblox-2021-nicktherobloxiant.v-game-hack In PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/italwhts-the-best-free-horror-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/easy-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/how-to-hack-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-robux-legit-no-virus-click-here_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-robux-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-games-where-you-can-play-music-for-free_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
font_00_sfnt_off00002d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D87 22100 bytes
SHA-256: 7fd1bef81a5787364aa4d87e7fdcc3c90cc8da5d021a90ef4b6a0b4f58a63ce3
font_01_sfnt_off00005d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D94 20096 bytes
SHA-256: b03d1507a07b8f0776a373fc995d23d7531e8c469e115a612e7cc55ac7e6a95f

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