Malicious PDF — malware analysis report

Static analysis result for SHA-256 173d80baf80c0a7e…

MALICIOUS

PDF

56.2 KB Created: 2020-09-01 15:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd32e8c083dec779ff4f16ee9889fbd5 SHA-1: acdebf4bef12ecb732d1ade5d0b1e5a403c74dea SHA-256: 173d80baf80c0a7ef6e19047007c8271efb2856e7719eb340100b4abe4e0d34f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to other PDFs. One of these links, https://ttraff.ru/wix?keyword=archaic+or+dialect+form+of+myself, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to direct users to malicious sites. No scripts were extracted, but the presence of a malicious redirector is a strong indicator of malicious intent.

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/wix?keyword=archaic+or+dialect+form+of+myself
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/daca0d_8ec3ea882ac74360bf966fa64a75ec0a.pdf
    • https://static.usrfiles.com/ugd/fb5067_9dc94e1bacb64fef97b29cd8a61462ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0e62151f5aa4009897c31c951668580.pdf
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/the_nail_fix.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/79450258784.pdf
    • https://cdn.shopify.com/s/files/1/0435/4211/8555/files/annihilation_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/giwejo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/walakifigipok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/calisthenic_movement_mobility_program.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/vasujetabukepegovuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/58764409599.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/16988641845.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_off00009c52.bin
87cccb227ef47043e40d9f7b905d01f8eee6ea390068801e31012f419b979b28
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C52 5352 bytes
font_01_sfnt_off0000ae65.bin
ca08be110fa6a337d493db0e9ed3b3e654d453d70a05aa500a4235d76673aaaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 11012 bytes