Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9d15b3056e7171…

MALICIOUS

PDF

44.3 KB Created: 2020-09-01 12:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17386e29727f65da05d7e006827f3362 SHA-1: 0874d26fa2681c58e2df37e0d8c65974c7c9c534 SHA-256: 5c9d15b3056e7171792a4d3fae06eaec7412fd3734ff03b8ab429b446c6e2d8a
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 30 external PDF links, many hosted on Shopify, designed to appear legitimate. One of these links, https://ttraff.cc/wix?keyword=ambulance+sound+song, is identified as a known malicious redirector. The document body is heavily obfuscated but contains the same malicious URL, suggesting the primary goal is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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/wix?keyword=ambulance+sound+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/ashrae_handbook_applications.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1644/files/kivozarobapupokev.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/gukowikebibefasatagexelob.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/14953859056.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/3._5_lords_of_madness.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/72073443081.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6310/files/divinity_original_sin_enhanced_edition_beginners_guide.pdf
    • https://cdn.shopify.com/s/files/1/0459/6999/7984/files/boss_katana_100_amp_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/84691569553.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/izotope_rx_advanced_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/wiripunos.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/lapolomur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuvinotagug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/mowawokekaliwax.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/41938963540.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_off00006e98.bin
0fa6f9cedee9d3b504f729cc33bc087ba328e1112b696a977c9e656b372ef932
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E98 5292 bytes
font_01_sfnt_off00008085.bin
3acd3f6eec1faaff5f9d091eb4a4747df2a63503f6cc2574990788a8abd6f5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8085 10480 bytes