Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b061776ec7f169d…

MALICIOUS

PDF

50.6 KB Created: 2020-08-30 09:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb248cf42db79a5338b5a87b95f6763 SHA-1: 5cb4584f38e5e4a4c937a19051c362860e9a65eb SHA-256: 9b061776ec7f169d19364f88816ceead1f2ad8dd0347e36de2e344ad3791e059
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Kef r300 review stereophile' and a URL that appears to be part of a link farm designed to attract search engine traffic. The primary malicious link identified is https://ttraff.com/wix?keyword=kef+r300+review+stereophile, which is likely intended to lead the user to a phishing or malware distribution site. The presence of numerous Shopify links, while many are marked as benign, suggests an attempt to blend malicious links with seemingly legitimate ones.

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/wix?keyword=kef+r300+review+stereophile
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/rosibidupofoxitenibo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/70824541875.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/85167680282.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_410772c1d87d4fa4bf2a356d0096700f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/31077343133.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/60449802170.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/ferexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/james_bond_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0438/0239/4786/files/insulation_foam_sheet_lowes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/lozopidivadorizorega.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/tevafas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b8c.bin
472e2b44201acf7bbf6f1063df8bc9bf94dab4499535fc4944ecf0a9c0d819cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8C 4888 bytes
font_01_sfnt_off00008c5c.bin
7ede2f00b861a3a7bc5a4d8c83bb45b53c48b5beef8c9a3e0a931935fd36f3d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 10212 bytes
font_02_sfnt_off0000af50.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 4324 bytes