Malicious PDF — malware analysis report

Static analysis result for SHA-256 73085ba46a88c13a…

MALICIOUS

PDF

56.1 KB Created: 2020-07-29 13:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caed2cba88b4c077b20835c22968f578 SHA-1: c749cbdbe441ae2f9e68e80bdf83ba1f4f950663 SHA-256: 73085ba46a88c13aef97eeae9a2daed0e0825ad3591f2b68ae99c290ddf1a21b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged the document as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a link farm or redirection attack.

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=bucket+steam+trap+pdf
    • http://files.atousaraissyan.com/uploads/1/3/0/7/130740563/wofore-kuruvuxajekadel-puposurubag.pdf
    • http://files.pvtennisclub.com/uploads/1/3/2/8/132815737/9502373.pdf
    • http://files.naturebajuicebar.com/uploads/1/3/0/7/130776567/4699531.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/15064715960.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/dojulusezakupetewiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/xegeximafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/94641699953.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/99615596416.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/rowizoxek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/ponelogokujodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/86243786404.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/jobaxidexabasopoduwunow.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/fepapopugefomisajut.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/9908051224.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/wabajalexib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/4430880956.pdf
    • https://cdn.shopify.com/s/files/1/0428/8453/0343/files/xutozi.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00008434.bin
b8d550a221c094efefd8dd813d9cd4d4765ea400db944e05cc39d3530a0204f6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8434 13260 bytes
font_00_sfnt_off00007339.bin
a4b14174543e3c6150ce0da4ee8f0ccc40cbe4a782a25a710838b5a9bc11ae5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 5000 bytes
font_02_sfnt_off0000a9df.bin
50688d9522c8e8f8e64cb08146f58cfe0f51a2cd4d0bf8d2358ebf834d565066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DF 12928 bytes

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