Malicious PDF — malware analysis report

Static analysis result for SHA-256 6903c2df773618bc…

MALICIOUS

PDF

32.4 KB Created: 2020-08-15 06:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c92f21ab9a798184872a89f19471f28 SHA-1: b7fe6d7c85dc62ff32afac961380ee16fc324b0c SHA-256: 6903c2df773618bcb9f632c0fde164092f93db35c90f7088db2f0aaf5d4c5c6c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body text and heuristics indicate a lure related to payment slips, suggesting a phishing attempt. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm and redirection tactics.

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/pify?keyword=an+form+payment+slip+2018
    • http://bizubesor.karengan.blog/uploads/1/3/1/3/131383483/7313414.pdf
    • http://files.enterframework.com/uploads/1/3/2/3/132303382/visexan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/kifujirovibawiwapevex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/a._p_and_g._p_series_formula.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/clipsal_pvc_conduit_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/bozeman_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/43193157268.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/84461272314.pdf
    • https://cdn.shopify.com/s/files/1/0435/3451/6376/files/carcinoma_de_celulas_escamosas_equino.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/stokes_theorem.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/ff14_drk_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/sewage_water_treatment.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_off00004195.bin
f7551870ee99fde21406fccb4bd120df59b5b2579f5f5a5a9d609ab493928b98
pdf-font-stream PDF embedded font (sfnt) at offset 0x4195 5660 bytes
font_01_sfnt_off000054c3.bin
764ae6e009c7806416a2ff56a1787373492b1c2d1bb95676465043e5708c2e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x54C3 9416 bytes