Malicious PDF — malware analysis report

Static analysis result for SHA-256 493877959c8e8c80…

MALICIOUS

PDF

39.5 KB Created: 2020-08-11 06:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4891a24fb779344fd50104e85381a84 SHA-1: 465443d7984423d16d4520496144ded423a62adc SHA-256: 493877959c8e8c80a930188b4ebda4a10641c19bd6e2c4ebc6d5db2d42c6eeeb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Ielts general reading samples pdf download' and the malicious URL, suggesting a lure for users seeking study materials. The presence of a link farm further supports the SEO-based lure. No scripts were extracted, but the primary malicious activity appears to be redirecting users to malicious infrastructure.

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.ru/pify?keyword=ielts+general+reading+samples+pdf+download
    • http://zufas.businessexpertise.net/uploads/1/3/2/3/132303382/7dcdc.pdf
    • http://lufeme.canoetaxi.com/uploads/1/3/2/6/132695569/1907b1a6aa8c716.pdf
    • http://files.erasmusbyprimerasupport.com/uploads/1/3/0/7/130739081/62eb6b401d.pdf
    • http://files.swlar.com/uploads/1/3/1/4/131454034/15a4acb00.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/31118454170.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/nuroxajezikeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/carpal_tunnel_syndrome_physiotherapy_management.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/30083880370.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/67485075569.pdf
    • https://cdn.shopify.com/s/files/1/0432/8010/5630/files/braden_escala.pdf
    • https://cdn.shopify.com/s/files/1/0434/0419/8044/files/39568839009.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/49388976041.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/xopemesamilufodesem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/zetaxonozoniwedaxada.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0822/files/nadoparibojafotukonunagex.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_off00005c2d.bin
af58827b70cffd4a2e1ca4b66520359c088edfa72f9dedf271e98a45b4315161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2D 5392 bytes
font_01_sfnt_off00006e7b.bin
ae53c71f06877006ed41850a015757d535f8c88e7764d96ff4aee243f370b2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7B 10188 bytes

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