Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b073d559e7d3f3…

MALICIOUS

PDF

59.7 KB Created: 2020-08-22 00:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ce88f72e5a00126d9ee90c802eb710 SHA-1: 59ef358c97f175676629385ef6f53a3dda99d2a9 SHA-256: 20b073d559e7d3f392403a1b9bb78c4f9e564a38d0e45f7464c39349a7957dde
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also hosts a large number of external links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or distributing malicious content. The ML classifier strongly flagged this PDF as malicious.

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=automated+guided+vehicle+ppt
    • http://files.ptunlimitedmhk.com/uploads/1/3/1/6/131636872/016a3d58.pdf
    • https://cdn.shopify.com/s/files/1/0440/4648/3606/files/29458843354.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/latest_uc_browser_for_java_phones.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/rockstar_app_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/99842606233.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/cakephp_form_validation_rules.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/47807340388.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/taxuzudusinuzefuronaputoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/sosamexepebesikuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/accounting_and_finance_for_banking_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6794/files/77630527399.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3355/files/handbook_of_chemical_and_biological_warfare_agents.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/science_encyclopedia.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a60a.bin
bd89f7806ead7e5f9522f8ea834252ed1421cf5d6e05e68c94e0bd73b67b2e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA60A 5260 bytes
font_01_sfnt_off0000b7d8.bin
0042cfe5993078a9d362fec7eed4f4cf2733097b2b09fc9db40a335fa95d23d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 13380 bytes