Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd46783ec8749b8…

MALICIOUS

PDF

36.9 KB Created: 2020-08-11 04:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d827f048f64fc10e7c046a67fe367bf3 SHA-1: b92a801154e707cfa51816a220ee1c608301544b SHA-256: 0cd46783ec8749b88cfdbc72c164a42ce10c6a5367ecd51ce4deb2c57694cf7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body itself contains garbled text and embedded URLs, reinforcing the malicious intent.

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=manual+de+prevenci%25C3%25B3n+del+blanqueo+de+capitales+alvarez+pastor+pdf
    • http://gufaz.recovery-partnership.org/uploads/1/3/1/6/131606875/sovibiropu.pdf
    • http://files.mountainxllc.com/uploads/1/3/1/3/131383825/1aa3b21d28d240a.pdf
    • http://revuku.peerteaching.co.uk/uploads/1/3/1/3/131383629/642342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/gamma_world_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/pdf_of_animal_farm.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/robe_of_the_archmagi_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/30089870179.pdf
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/social_media_marketing_plan_for_restaurants.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/zodup.pdf
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/eilifsen_auditing_and_assurance_services.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/professional_recommendation_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/87443695376.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/83672907308.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_off00004b31.bin
e9668adf2ac70dc88b840f91bc1b7ac23859f44d62c8892ec98c31f3427633ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B31 5664 bytes
font_01_sfnt_off00005e49.bin
e53b57979f8b3e61943485783afc0330c1d448634d1fdba6a71f18fdbfffd7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E49 11308 bytes