Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70d04b42251f0ba…

MALICIOUS

PDF

43.5 KB Created: 2020-08-09 04:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24126ccd4997c7d1fa60181a3c8aafa7 SHA-1: 4d9d0e2a37e95c70b3b149d295615840596072dc SHA-256: d70d04b42251f0ba2b4428d0b26c9a6c7f7d92682a00c50c9051292abf978099
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting the primary goal is to redirect the user to malicious infrastructure. 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.ru/pify?keyword=autoestima+automatica+pdf+gratis
    • http://files.drmenn.com/uploads/1/3/1/3/131379253/c4e4a3189.pdf
    • http://files.quintessencesilk.com/uploads/1/3/2/8/132814958/9347086.pdf
    • http://files.socialtheorywatch.org/uploads/1/3/1/6/131606248/1003437.pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.diannesk9connection.com/uploads/1/3/0/9/130969191/a0ed3e62.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/52306069314.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3481/files/peminisixosadodesizomijow.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/could_not_find_function_ggplot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/58457718967.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/38967553776.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/bangladesh_map_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/totowawosifuwirovopexeber.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6619/files/24_consonant_sounds_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/molijetavoxemekox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/45295158758.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/jowavadupezet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/28147258344.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/kabiti.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_off000069a9.bin
75843396e090ef6d5fbeabe97f968395a4717e24369a6b2257c49309a02d0dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A9 5432 bytes
font_01_sfnt_off00007c0f.bin
8abbc45dea86ab1b719d1dbde2c8ed164fb74528f98a649de542000ae29af133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0F 10912 bytes

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