Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f551d802e115f90…

MALICIOUS

PDF

38.3 KB Created: 2020-08-31 12:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19b1c583406dc32811a7561441d92b0 SHA-1: 918820adcb177209ffb10f32ca3c52a6e895d7b6 SHA-256: 6f551d802e115f902bf7c6315ffed64ff2097edcc71b8be7e1f67c9d0102ba3c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=metricas+de+software+pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of embedded links and the heuristic firings suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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.com/wix?keyword=metricas+de+software+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/xiwisawovof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/janusuvez.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/58008200275.pdf
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/99092708058.pdf
    • https://cdn.shopify.com/s/files/1/0464/6040/3880/files/18039365143.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/the_metaphysics_of_the_healing.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/negejodajuvuxilokeforupim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/rerig.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/95005011943.pdf
    • https://static.usrfiles.com/ugd/e2b09b_f990f10c9aa44f3089d4123cac56485a.pdf
    • https://static.usrfiles.com/ugd/3f80ec_5907ef364e734a3ba8cfd7ef9b7c89b3.pdf
    • https://static.usrfiles.com/ugd/aef5b7_778ea74202a848cda7db9e948fd1654d.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_off00005932.bin
f3a363fe5f89c33dcc4bac7c9ad5654d96cb0e7fc2777ee6734c31b7b9deb1ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 5216 bytes
font_01_sfnt_off00006b1d.bin
0a8a5b9def4d1e345fc7b42e22921b78a168c7930e8638fb7e62f4453b512606
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1D 9952 bytes