Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ad1853b7b9edde…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e258ad84a806be9597599a61f81871 SHA-1: d72c783842bd62582279d511aa6d7aae2cf8a14b SHA-256: 73ad1853b7b9edde321f1558af187a2c6b1f9ae74f0492d74bfa91751781d71b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, one of which is a redirector. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking PDF links hosted on Shopify, likely to lend legitimacy. The primary malicious URL is `https://ttraff.cc/wix?keyword=vault+tec+population+management+system`.

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/wix?keyword=vault+tec+population+management+system
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/14465569072.pdf
    • https://cdn.shopify.com/s/files/1/0463/1065/4109/files/wosofuragetas.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/lil_wayne_discography.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/sweetheart_bodice_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/14194839526.pdf
    • https://cdn.shopify.com/s/files/1/0440/7289/4629/files/41920073311.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/refitapobofubogiwimubik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/51362050902.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/52354065270.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7800/6437/files/59516528625.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/adhyatma_ramayana_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4831/9638/files/powexijedi.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_off0000606e.bin
63b7aecbc4dff1db45e2e201c601a05a606cccfdbf5fb97368109f97f8356012
pdf-font-stream PDF embedded font (sfnt) at offset 0x606E 5224 bytes
font_01_sfnt_off00007230.bin
af8928dd9cf46261eac1c062b45b17157fa758f29643761683540ad290fd758f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7230 10384 bytes