Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5d79e003c2202d…

MALICIOUS

PDF

38.6 KB Created: 2020-08-09 16:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4550853cc6a25530af0971bfc2ac7a7 SHA-1: 77d1171928ed7692919269a92e11717da11c28bf SHA-256: 5a5d79e003c2202d7e8e0cf9fa0313b07e93a6520c1bf9a066da73ba8910c740
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm strategy. One of the primary links, 'https://ttraff.cc/pify?keyword=barcos+que+vuelan+pdf+gratis', is flagged as a malicious redirector, suggesting the document's purpose is to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=barcos+que+vuelan+pdf+gratis
    • http://solisa.madeleinerostami.com/uploads/1/3/1/6/131606552/f46e9d358b892.pdf
    • http://files.jujuic.com/uploads/1/3/0/8/130874338/1b39d759b2.pdf
    • http://files.domandlesliermt.com/uploads/1/3/1/6/131606672/7673631.pdf
    • http://wejam.relap.com/uploads/1/3/1/8/131856158/wirilafade_basugujoxe_verasis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/samsung_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/wixexavaxotel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/7054247958.pdf
    • https://cdn.shopify.com/s/files/1/0432/8295/6443/files/how_to_protect_in_adobe_reader_xi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/8143359157.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/sixemefekogulizamexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/77670324899.pdf
    • https://cdn.shopify.com/s/files/1/0436/5071/1705/files/hs_1st_year_biology_book.pdf
    • https://cdn.shopify.com/s/files/1/0444/6031/0695/files/catan_seafarers_5_6_player_extension.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/39690918402.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/6477809526.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/50_shades_of_grey_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/ca_inter_books_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000492f.bin
fb339260f7586722c52d23925149d76465ade60d24e67fd40b55dbe8c192ce68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x492F 5440 bytes
font_01_sfnt_off00005bbb.bin
8a247e8661c122eccc91de56a2792b5310ac3ab4755950bde593081630e3d915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBB 10964 bytes
font_02_sfnt_off00007f6a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6A 4324 bytes

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