Malicious PDF — malware analysis report

Static analysis result for SHA-256 722e59f5c5d85023…

MALICIOUS

PDF

39.8 KB Created: 2020-08-04 13:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ccd2a6ceac36db3250a2c563fe23066 SHA-1: d6bcfd4544f8158d8137c421098d8024935d5f3c SHA-256: 722e59f5c5d850231d4a3c608e2c472e7f8f12e0eb9692a5608d20f6b8c7feca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=bank+po+syllabus+2020+pdf+free+download', which is likely used to redirect users to malicious content. The document body, though partially corrupted, contains text related to a bank PO syllabus and the malicious URL, reinforcing the lure.

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=bank+po+syllabus+2020+pdf+free+download
    • http://files.owenandassociatesswla.com/uploads/1/3/0/7/130739463/a4573.pdf
    • http://files.492snackoshop.com/uploads/1/3/1/4/131452878/kitolobinuwaf.pdf
    • http://files.qbta.ca/uploads/1/3/2/6/132681931/9504fce114d5.pdf
    • http://files.stewartcellostudio.com/uploads/1/3/2/7/132740193/f7e599141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/99410681914.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/39673249626.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7253/files/94498440615.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/37145438627.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/24660783129.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1637/files/nezebowurun.pdf
    • https://cdn.shopify.com/s/files/1/0433/2129/5006/files/convertir_a_dwg_online.pdf
    • https://cdn.shopify.com/s/files/1/0443/0607/1708/files/algebra_and_trigonometry_ninth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/bafanolitaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/nizuxofetuwowe.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b88.bin
873fbe0d358b375e36b110047f39ce8e75878b2e3d67b46b660fe35f25ab9fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B88 5756 bytes
font_01_sfnt_off00006f47.bin
b990a619a467e37de25323ccd2a52881f2e7a12b307de12bca2b07acbeacbc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 10448 bytes

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