Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ca0b3a890a7a02…

MALICIOUS

PDF

37.5 KB Created: 2020-08-17 15:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9213b3ca0b626af524df61762585be7 SHA-1: 55173fb15dc62bfa9aa7bd9c00f4442eb40ef885 SHA-256: b8ca0b3a890a7a0275e669f6f92cae918c51cec1b44464faf298d12bc09691cf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and references to other PDF files, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=a+wrinkle+in+time+imdb+parents+guide
    • http://files.jvonhdesigns.com/uploads/1/3/0/8/130814868/26e94e.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/42615604923.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/guxebolupiwex.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/15807245121.pdf
    • https://cdn.shopify.com/s/files/1/0440/5703/4902/files/gaduxewepefufujo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/bikujalimixolaropupoja.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/environmental_virtue_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/6122723394.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/ecocardiografia_fetal.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/85532510550.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/xisamasazepebole.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/vakowifuwevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/womupojipevifowogimefu.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_off00005430.bin
b0e743c87d0506519cbecae1bd16b37f9523e911e6e9243f57ee091d442167d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5430 5564 bytes
font_01_sfnt_off00006700.bin
9f9b2fb68adc3a5548af6a2b638a7cccab5c73787db7b6d2e7e20307c81277ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 9972 bytes