Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caf5be7dd86943d…

MALICIOUS

PDF

38.2 KB Created: 2020-08-21 01:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f4dbd6a4b900522883b32b38b0ea86 SHA-1: 807d7442117d5e5066cc54a7335e9a011948336c SHA-256: 3caf5be7dd86943dccd263426c8583b29fa3996570a801a558ef63d586c9c57b
128 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains text related to an "rrb clerk admit card" and a URL that mirrors the malicious redirector, suggesting a lure to download malicious content. The presence of numerous external PDF links, many hosted on Shopify, further supports the SEO-based lure tactic.

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 https://ttraff.cc/pify?keyword=rrb+clerk+admit+card+2019+ibps+guide
    • http://xosibil.cudonal.com/uploads/1/3/1/8/131856326/8771168.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/romuwigemarubilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/joxigepotuvogivis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5589/files/64185067458.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/adverbs_worksheet_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/best_books_on_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/7256606033.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/nimupenebawuxowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7871/2472/files/badosumikovinob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/nouer_cravate.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/88640225696.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005541.bin
a5b130fb025a4659789cf31b3440f31bc02b3cb4955e42dcc05c1d037e00f29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5541 6084 bytes
font_01_sfnt_off000069de.bin
3ce36f18a8c78bc07000cbefe336fba124f3240dc64d57aec268df6ef5f3e0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DE 10228 bytes

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