Malicious PDF — malware analysis report

Static analysis result for SHA-256 37636ff64eed52d6…

MALICIOUS

PDF

55.0 KB Created: 2020-08-07 23:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c08fda065d7b132008fef7bb2601f797 SHA-1: 30ad03a63c5febc0c0d10681c602e34517f25971 SHA-256: 37636ff64eed52d622567b8fac1e5dede1757e50c139fc1739f443531f95b47d
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate study material, but the primary link redirects to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting the PDF's purpose is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ccna+200+125+pdf+book
    • http://files.audreyalejandro.com/uploads/1/3/0/8/130873876/padezurivulem-lopixunojeduf-jotibinalagebi-tusijotowi.pdf
    • http://files.vrbeforeitstoolate.org/uploads/1/3/2/8/132814146/15036894e.pdf
    • http://files.alivesoap.com/uploads/1/3/2/6/132681769/zidisawewe.pdf
    • http://files.groennfell.com/uploads/1/3/0/9/130969300/303fe0908.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9574/files/pusatuxegux.pdf
    • https://cdn.shopify.com/s/files/1/0429/0514/1411/files/fedefivutukorekavuliko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/fozabaxoganekovoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/jewojazumerim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagitigupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/using_windows_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/bank_aptitude_short_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/durapek.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/97396988930.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_off000097dc.bin
06d3bd731460dceac913ecfcb7f15e4d322530f9683971384d02b6e773fedee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DC 5404 bytes
font_01_sfnt_off0000aa59.bin
e60164956527b700bba0de34d426af01bd8f31533cdb62240c94b5ae9529737a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA59 10820 bytes

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