Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab7340f7dcb01d8…

MALICIOUS

PDF

39.6 KB Created: 2020-08-04 19:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6bf68b341a89a192d1dbe543c1d0a17 SHA-1: 19649a00903771e860f41743acf9d730b23f7edd SHA-256: aab7340f7dcb01d8d3a3a8f790b1429a635cce3fdcc818fc9c9cfa9c32ff3ea8
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. The document body contains obfuscated text and a URL that appears to be part of a link farm designed to lure users to malicious content. The primary attack pattern involves directing users to potentially harmful external sites through a series of redirects.

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=geographic+information+systems+and+science+3rd+edition+pdf
    • http://files.mx.nrvprocessing.com/uploads/1/3/0/9/130969300/8368675.pdf
    • http://files.issl.space/uploads/1/3/0/7/130776088/leninibo.pdf
    • http://files.gretelparker.com/uploads/1/3/2/7/132712306/5383553.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/74495558849.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/sebetokosanerukela.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/30531783162.pdf
    • https://cdn.shopify.com/s/files/1/0441/1044/6744/files/read_book_of_enoch.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/41139124139.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/gogijawobitukituw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/nobim.pdf
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/79643106027.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/eamon_fuck_it.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_off00005aa1.bin
b7e2b0d24baa2887aaba3cd296a72e3dec99ea6467aebe26c43b730fb33eedbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA1 5836 bytes
font_01_sfnt_off00006e69.bin
bea13621d03b931ec49dfa93787bc63d8ea112fa0fc7181a4208e7a23ac4cb02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E69 10312 bytes

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