Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6e932388b8a938…

MALICIOUS

PDF

37.8 KB Created: 2020-08-20 19:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac21b5ec6f02e2ec25da0753b12407a7 SHA-1: 36f57af1585f055c90cf7c74ed05d942e904fc06 SHA-256: 4e6e932388b8a93880198df1d62e9abfbedeb66de1156db1cc21bd18e2b375a9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious content.

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=howrah+sonatala+weather+report
    • http://files.bearstatebowhunters.com/uploads/1/3/1/0/131069744/bosumekiv.pdf
    • http://files.thenextbigthink.co/uploads/1/3/0/7/130739238/domasafuv-bebujes-numilo.pdf
    • http://files.dawnhorstead.com/uploads/1/3/0/7/130740591/lezemubopag-foxikesutofa-dovixoxa-vekiguw.pdf
    • http://dalawop.rhodanagency.com/uploads/1/3/2/7/132741136/buvenuzokinuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/rakidijozakivisevazulof.pdf
    • https://cdn.shopify.com/s/files/1/0447/8307/5477/files/bi_rads_atlas_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/zekujog.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/71856027302.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/sipigijejesogif.pdf
    • https://cdn.shopify.com/s/files/1/0460/1924/8295/files/95804184793.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7389/files/33260361203.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/78899882615.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_off000054e7.bin
6caf15f69913c02c800253424876d5a1168d0ba5c0b4cb1ec3dd7897939ba5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E7 4960 bytes
font_01_sfnt_off000065c8.bin
61d77e14c2bd5760736a72f060b7c0437acaf2c98b0d30c5bc18ab504e719fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C8 10304 bytes

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