Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e543625b4a0a5db…

MALICIOUS

PDF

40.4 KB Created: 2020-08-10 15:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b3aed89e7d59fad6896d3e3d508f784 SHA-1: 343364ca141cec84f2172585ecc7eb2fe08e106b SHA-256: 0e543625b4a0a5dbcc4ae7b6c46c73a30ba28c84474565d94187ac6e5c6c74b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, disguised as academic content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=bse+odisha+8th+class+odia+grammar+book+download+pdf
    • http://files.theloopdeloop.com/uploads/1/3/1/3/131380651/kipuvuviluxoru_gajuse_tituxikop.pdf
    • http://files.volcanolakeadventure.com/uploads/1/3/1/6/131636792/4001623.pdf
    • http://wedufiten.burtongreenparishcouncil.org/uploads/1/3/1/0/131070109/331c5e298d7d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/swot_analysis_of_unilever_company.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/equations_of_straight_lines_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/nagunosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2362/9477/files/14479182203.pdf
    • https://cdn.shopify.com/s/files/1/0449/5107/7032/files/harvest_moon_gba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69143450337.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/48272805187.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/jodapaneraxuturusinedi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1243/7662/files/34238140927.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/74443722044.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048db.bin
5b58c88db2219b4973ebfdde5af2810891b479216fa8849d767cb321dde93061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48DB 6108 bytes
font_01_sfnt_off00005d8e.bin
e9ecc3ff3dd8c22f074d751722d842753d3649a82ee81285a65206a74a328ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8E 9804 bytes
font_02_sfnt_off00007f70.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 16068 bytes

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