Malicious PDF — malware analysis report

Static analysis result for SHA-256 711d7ca307cf367f…

MALICIOUS

PDF

44.5 KB Created: 2020-08-22 19:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8001ff8d6c0862efe2eff8c88a9dc2ad SHA-1: da2dda58803e5a1a8c9d9823e46e06280ee4bca6 SHA-256: 711d7ca307cf367f668361486173d391ce10788675839e187edf2a8f57b32fb6
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one that redirects to known malicious infrastructure. The document body, though obfuscated, appears to be a lure for clicking the embedded link, likely to download a second-stage payload. The ML classifier strongly indicates 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.com/pify?keyword=graphic+design+artwork+approval+form
    • http://files.makingpeoplewhole.org/uploads/1/3/2/3/132302759/1808753.pdf
    • http://files.emavotw.com/uploads/1/3/0/7/130775953/ravoxarugob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4906/6394/files/56228991223.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/85078393330.pdf
    • https://cdn.shopify.com/s/files/1/0431/3779/4204/files/fujewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/vazedoganimipefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/twinkle_twinkle_little_star_variations_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/3094/4671/files/expenses_sheet_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/40283531712.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/38038383210.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/89841311787.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_off000060d3.bin
8f3634b6122238aba643f8dfac6170fb869cc2d70fcb1bbaadcdeaedf20efda3
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 5604 bytes
font_01_sfnt_off000073cf.bin
2781dbdf8dea09668f04586878289f6ffe37743f532b215fc7aa3636afefeecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CF 10472 bytes
font_02_sfnt_off00009776.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9776 4324 bytes