Malicious PDF — malware analysis report

Static analysis result for SHA-256 1791beeb391ec5da…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 18:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36154454197e4304373733738bd6ab45 SHA-1: f82a35aedc15c74275ba68fb8fdc391c88a7c88d SHA-256: 1791beeb391ec5da0f919e068c65812fc5b0b3a1b9de1cc5cbd19417206fb02f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites, potentially for malware distribution or phishing.

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=tripartite+guidelines+on+term+contract+employees
    • http://zosaguw.wolfridgearchery.org/uploads/1/3/0/7/130738511/judiputelexebi_sasuxut_janusubekovogob.pdf
    • http://wuwaxaku.catenajobsplus.com/uploads/1/3/1/0/131070109/lafenizoniji.pdf
    • http://files.manufixed.com/uploads/1/3/1/3/131379496/7122752.pdf
    • http://vomijirov.simplycrafted.com/uploads/1/3/1/0/131070161/788984.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/26101182311.pdf
    • https://cdn.shopify.com/s/files/1/0434/3909/5973/files/70995338218.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/76437886134.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/bezedofuzidudirimubijoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/convert_fraction_to_percentage_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/88739335317.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/improving_public_policy_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9481/7445/files/cracking_the_millionaire_code_mark_victor_hansen.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_off00005f08.bin
24a80f4607770a78b26db7321eae5ad7c552655e09275a1099ddafb856a9ea55
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F08 5444 bytes
font_01_sfnt_off00007178.bin
6f30fc642735c156d49eb3483a21fc4c374f3ba9c9c0ace6c3312c7a104f120d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 9784 bytes