Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a1dda38030aa3b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b1f680ea58df9e5d3937a5a576f8585 SHA-1: 950be9c5e0c502227d1c5ab5e65f2d9bb60007fc SHA-256: 82a1dda38030aa3bda0435ab7094b88e32f9f0f62bc1ea1b925d14754489454f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The presence of numerous external PDF links suggests an attempt to create an SEO link farm, potentially for malicious purposes. No scripts were extracted from this sample, and the document body is heavily obfuscated.

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.ru/pify?keyword=platform+cafe+pontianak
    • http://files.naturaphysicaltherapy.org/uploads/1/3/1/0/131070722/9179889.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/4882623254.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/rilele.pdf
    • https://cdn.shopify.com/s/files/1/0447/4670/2999/files/fifabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/isrotel_beresheet_hotel_mitzpe_ramon.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/kaletefa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/83055258201.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/98015692168.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/96356146452.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/human_anatomy_body_parts.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_off00006cdc.bin
db6711114bb23008e6bed4203110404a3b4fc3ca2e4aab4270b81bee47c052d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 5048 bytes
font_01_sfnt_off00007df1.bin
db41b20f49db9daa7ab8acceb36abc424358c2c025601c248d81fde2bcd17086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF1 10556 bytes

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