Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a4633a5ea78f0e…

MALICIOUS

PDF

47.2 KB Created: 2020-07-23 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fde449053e93c6655e06b540a395867 SHA-1: db99e9f86e17a1691aa0055cb141334a51bf90e2 SHA-256: 97a4633a5ea78f0eb1fe5bc7ed4e14403dc7a4a1ca674e0885804b6837f58542
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains known for hosting link farms and redirectors. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious URLs. The critical PDF_MALICIOUS_REDIRECTOR_LINK firing confirms that at least one of these links leads to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document.

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.cc/pify?keyword=analytic+function+problems+pdf
    • http://files.wilsoninteriordesign.com/uploads/1/3/2/8/132814375/rolixajitot.pdf
    • http://files.theaterdanceworkshop.org/uploads/1/3/0/7/130738607/d001413b65a2.pdf
    • http://files.stonehedge.us/uploads/1/3/1/4/131453543/5401787.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://files.okeisan.com.au/uploads/1/3/2/7/132740458/pumibusodi-zeselura-viwewazev-zasowaribev.pdf
    • http://files.wilsoninteriordesign.com/uploads/1/3/2/8/13
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/tezafaderesalesizuzedak.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/68445351039.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/82476691217.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/desimoniweladolabeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/lasuzulidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4505/9749/files/66052336503.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/gilunanovogogavuwojarejes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/21145807535.pdf
    • https://cdn.shopify.com/s/files/1/0434/9408/0677/files/sewawutedab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/64435116380.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_off00007938.bin
d3389f8b49b653f3b2784a7fd4b03328f66bfb87d9d5867208c1a89c717ca597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7938 5416 bytes
font_01_sfnt_off00008b82.bin
abf479cbbf0ca74a182ca2f4dce4a1119163edd941ba4f0de589bc98c330614c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B82 10548 bytes

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