Malicious PDF — malware analysis report

Static analysis result for SHA-256 818614d4813dfc68…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 02:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86f7507f7cce62ce4dad8dc38a00caea SHA-1: 3f96900bb064e7e2eac14fa698c29463bfe85f80 SHA-256: 818614d4813dfc68aed12d1c08ee79200933cce7ca2abe63875aba6f398ec507
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDFs, likely for SEO manipulation. Crucially, one embedded URL, 'https://ttraff.ru/pify?keyword=vbscript+date+format+dd+mm+yy', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of a malicious redirector suggests an attempt to lure users to malicious content, potentially leading to further compromise.

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=vbscript+date+format+dd+mm+yy
    • http://files.luskccmaths.com/uploads/1/3/1/3/131379833/zikinitewatizoj_xitukok_xijuvitatu_joxut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/adobe_reader_to_word_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/vegeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/fumexafegixijilal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/fepokibuzabiwadozip.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/86242662198.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/e46_bentley_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3742/5818/files/68962050877.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/cluster_computing_abstract.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/pikipasuxubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/74927405186.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_off000058d3.bin
f14e65268699c11a1fa7206a35364bfb734230370f25ac4474c564cd96830c90
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 5476 bytes
font_01_sfnt_off00006b59.bin
8aefebb5ac84bbaa9377aec01692f74c218aa80e8c2c5b799881fdce69491c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B59 15168 bytes