Malicious PDF — malware analysis report

Static analysis result for SHA-256 0758cbaf808e8fda…

MALICIOUS

PDF

39.6 KB Created: 2020-08-15 14:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c8a341dbb91dc7762d900d41e4e0637 SHA-1: 0e595353b33412525cdee09c37289d9469acb604 SHA-256: 0758cbaf808e8fda59f3c241e84bae9c8d6b8dac292230904f3539bdd089763e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector and several benign-looking PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing 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/wb?keyword=cartesian%20diver%20experiment%20pdf
    • http://files.newtesting.org/uploads/1/3/1/3/131383934/edc839013e7036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9631/files/list_of_adjectives_to_describe_personality.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5234/files/beropevidamaruzusorizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/synonyms_worksheet_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/bratstvo_crnog_bodea_19.pdf
    • https://cdn.shopify.com/s/files/1/0437/6585/8455/files/15393713905.pdf
    • https://cdn.shopify.com/s/files/1/0447/9208/6685/files/eighteenth_brumaire_of_louis_bonaparte.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/6189050145.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/70696340192.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/abc_song_for_child_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/47821097736.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_off00005e15.bin
623286a120e6cb806b4ebdf6a40cf2e333a5be7c0b98e08f5665428d593b5b41
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 5188 bytes
font_01_sfnt_off00006faf.bin
0c02ac0d896d4402f53475d7031ba5f094368d3b9314d0e1308a265ce3199996
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAF 10076 bytes