Malicious PDF — malware analysis report

Static analysis result for SHA-256 1684d9c47594c9b0…

MALICIOUS

PDF

52.8 KB Created: 2020-07-28 02:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67cbfc9fa86b253369a833b1fccf871 SHA-1: afc129252b54a06287d15c36c67f0959e78463b1 SHA-256: 1684d9c47594c9b0f4f813a71eb767ea6d0e7a438e68cd3ce87a4be8d91620f5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

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=ap+ssc+memo++2014
    • http://files.johannestecroix.com/uploads/1/3/1/4/131407737/2241a4b43286.pdf
    • http://files.albums-of-photos.com/uploads/1/3/0/8/130813317/fa18ece6.pdf
    • http://files.designburlington.com/uploads/1/3/1/8/131856358/306a408.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/zugufanimatozobemiwanun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/penewitubaniwadesorabonuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/58685762528.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/51692446805.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/95670977311.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/41087516991.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/87510037478.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/64256481972.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/73907740403.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/rosugogide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3194/3585/files/34438010763.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_off000093b8.bin
9d61c64188315cb9381141ce92ad1b23b41970a4c52cb21d7a43bbd5960c3550
pdf-font-stream PDF embedded font (sfnt) at offset 0x93B8 4696 bytes
font_01_sfnt_off0000a3a9.bin
f266b22c5e35b49b303ed14d83b9a0f7df0854fddebce8765c539aada6adc3ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A9 10052 bytes