Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cea858834cd35c…

MALICIOUS

PDF

44.1 KB Created: 2020-07-31 06:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b5c140a5efb64b8a0b7f5027c49a05 SHA-1: 7b30a9ebe13557ee2a6185dc13b39054f7b204b6 SHA-256: 72cea858834cd35c2cc0853330bbece936eccdf9f6ea5065f7ccdf473b4bbdfc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to distribute content or lure users to malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the malicious redirector strongly suggest a phishing or malware distribution campaign.

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/pify?keyword=oxigeno+disuelto+en+aguas+residuales+pdf
    • http://files.lwemporium.com/uploads/1/3/1/4/131453897/e5c8935da5149.pdf
    • http://files.devonatanner.com/uploads/1/3/0/7/130739810/ce1efccab.pdf
    • http://files.hansenmath.org/uploads/1/3/0/7/130739404/wafotepe-mabinamisuj-jaxosaleguboku-mesojupapoton.pdf
    • http://files.puriri-wiltshire.co.nz/uploads/1/3/1/4/131436991/xenesadodega_lozaxedevo_libisawerab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/vesuwoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/23543333952.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/51907488151.pdf
    • https://cdn.shopify.com/s/files/1/0433/9099/2549/files/84473734593.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/nolatujabiditiwapizus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9064/files/22219364961.pdf
    • https://cdn.shopify.com/s/files/1/0434/2690/6264/files/99745223863.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/21389407168.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/nuritiwadagovujifolan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/suvedojuga.pdf
    • https://cdn.shopify.com/s/files/1/0436/4845/0718/files/fikopupejup.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_off00006ebf.bin
a97d24714c76736cb80a273d0b82580d1d92889a0fd07ad60ceb72200a2d634f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBF 5188 bytes
font_01_sfnt_off00008074.bin
35c528425a5a128950f1c7d1e63c51860d1558d74c4e798a0fee247e132437c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8074 10212 bytes