Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51314428948d253…

MALICIOUS

PDF

51.8 KB Created: 2020-08-19 04:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c558d371e2dfd146b77a7230749083e0 SHA-1: 12b407bd17211082ad43f2e13636470305103970 SHA-256: f51314428948d253be370802f18c43a82aa015c464f226d0b5482c105086ffdb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily corrupted, contains the same URL, suggesting the primary intent is to redirect users to malicious content. No scripts were extracted from this sample.

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/pify?keyword=audio+songs++free+for+mobile
    • http://files.fremontsailingclub.org/uploads/1/3/0/7/130776111/6195484.pdf
    • http://files.stresscafe.com.au/uploads/1/3/2/6/132681164/4c0c2b2161022.pdf
    • http://files.randomnet.net/uploads/1/3/0/7/130776037/delel-xulowuliluwawan-wagepanonotu-jabejuxa.pdf
    • http://vuvugolod.mrsmilewski.com/uploads/1/3/0/8/130813765/vupuverapowiwajerov.pdf
    • http://gipap.wistormeliteallstars.net/uploads/1/3/2/6/132682790/wuboke.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/69701086906.pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/light_novel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1913/files/3558627195.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/64733663760.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/bar_graph_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6958/files/fidal.pdf
    • https://cdn.shopify.com/s/files/1/0459/9175/5938/files/bts_idol_performance_mama.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/6356289462.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/play_store_app_for_iphone_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/mezuroxupuxobadajuvukosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/30254973874.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/voripikazip.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_off0000860d.bin
27689c723f2cf5314ca960b95e5ad7152108287e1daaa8bd03f5ab1eb86b741e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860D 5148 bytes
font_01_sfnt_off00009771.bin
cdf2ee1bab5e8dac8854ae90b0dc23c211df686f640fd873d7cbcad65c59ab34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9771 13352 bytes

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