Malicious PDF — malware analysis report

Static analysis result for SHA-256 111be647c05ef224…

MALICIOUS

PDF

44.8 KB Created: 2020-08-21 18:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f2ed5f2e32537c34edd9e1cdc999e7f SHA-1: dd841d427e014dc8a208e1fbdb2553b63ba77c20 SHA-256: 111be647c05ef2246a3f4ae15721e8c230e9bc1c2eec326644a55e9a834a86f5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a bursary application. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to known malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection.

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=funza+lushaka+bursary+application+form+for+2020
    • http://xebom.tobincosten.com/uploads/1/3/0/8/130813095/31fbb65f2b071.pdf
    • http://files.healingdollway.com/uploads/1/3/0/7/130775679/mavazigifatudolubexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/rexufufiboromokodorufasi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/xipojakopowepakiridabas.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/rufalimuxaliwil.pdf
    • https://cdn.shopify.com/s/files/1/0452/5237/8784/files/pexetez.pdf
    • https://cdn.shopify.com/s/files/1/0439/3123/8555/files/vawadew.pdf
    • https://cdn.shopify.com/s/files/1/0433/5347/3189/files/chemical_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/business_letter_block_format_with_letterhead.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/google_sheets_count_if_substring.pdf
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/97969395054.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f13.bin
1d17ae68bb91b15241a7adfa11015e4102d3499bb84d21f398d9e81697231f40
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 5840 bytes
font_01_sfnt_off000082ca.bin
8abafd2ecf44cf548654322a0de429dbacdc5ee12c653f1bb85a0cf9cb5c806a
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 10440 bytes