Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f43c7d4245c2ff…

MALICIOUS

PDF

48.6 KB Created: 2020-08-04 03:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160fd99258f83d9c316be2b0bf32b2e3 SHA-1: 51f7968cdde057f4e407abd99fa062520ffbc44b SHA-256: 52f43c7d4245c2ff96f9bc88f3945940e18ec9886591dc011d25ef6fb2cadd2b
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=canales+ionicos+tipos+pdf, which is likely used to funnel users to further malicious content. The document body itself is heavily obfuscated but contains references to the malicious URL and benign-looking Shopify URLs, suggesting a lure to disguise the malicious intent. 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.ru/pify?keyword=canales+ionicos+tipos+pdf
    • http://files.earlyhorizons.com/uploads/1/3/0/7/130739678/6396433.pdf
    • http://files.lymeislame.com/uploads/1/3/1/6/131637137/5643900.pdf
    • http://files.tulipcity.org/uploads/1/3/0/8/130874433/fuxugeni_ferulepav_lagomeji_luwuvukaru.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/96366439887.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/form_nys-_45.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/97840827454.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/55785345816.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/elixir_of_agony_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/kobufilimujaxudorejedev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2870/8519/files/55943609435.pdf
    • https://cdn.shopify.com/s/files/1/0435/1819/7912/files/69224997184.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/65788980576.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/juvijonanitabizuwolev.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_off00007fbf.bin
a5f7c9f055957a5c3de98d0d82d04d293d4405e6ddb73216a0f7d6d32449156f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBF 4960 bytes
font_01_sfnt_off000090b4.bin
5348deb4f92de7fc45f90f56b470dc8e5d7cd228bebb11c2d2bb87ddc3bb277c
pdf-font-stream PDF embedded font (sfnt) at offset 0x90B4 10812 bytes