Malicious PDF — malware analysis report

Static analysis result for SHA-256 9169ddd4241e022c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 10:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11617d67024b4e5b9cbe26e7542130d8 SHA-1: 511aaabc4b6ef7ac3b40ffaf2028852e0f05b85a SHA-256: 9169ddd4241e022cc3700a3c7de2fdaa78542512281233eb833befdd3248567b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain. The document body, though heavily obfuscated, contains the same redirector URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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=mandatory+reporting+elder+abuse+oregon
    • http://bopos.ocatilloaudiovisual.com/uploads/1/3/1/6/131606552/bakab_kaxoragofizu.pdf
    • http://jarolebi.savonneriedelestrie.ca/uploads/1/3/1/6/131606346/divovodes.pdf
    • https://cdn.shopify.com/s/files/1/0439/8913/9614/files/79620998118.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/70038448013.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/nopekikejekuxefopavifas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2735/8115/files/82268879405.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/govomoxupibalevuzelapoga.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/word_formation_verb_noun_adjective_adverb.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/fofurolatagefexol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/active_voice_and_passive_voice_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0061/files/19087810720.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/xaduz.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cb8.bin
10182382ef4197b9e22e8d01e859b5f146667f9b47c5bfed72b13b35962d8529
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB8 5372 bytes
font_01_sfnt_off00006f10.bin
cda89b890e0bcea7329bb5cd1e421acb53cf7269ff83308257f20fd120e71d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 9844 bytes