Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ca3d5ab820f967…

MALICIOUS

PDF

48.8 KB Created: 2020-08-07 23:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22068d6b570527f6c997d9e910d5a7c9 SHA-1: 9d5a566b5935bd8ac9a85b05b77049ac1270187b SHA-256: 28ca3d5ab820f967e1b2bfb56ab2e1f7c981cdf6b6755c2db99f65909b5ed0eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a redirector at ttraff.ru. The ML classifier strongly indicates maliciousness. The presence of numerous links, including a redirector, suggests a social engineering tactic to lure users to malicious sites, likely for malware delivery or phishing.

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/wb?keyword=deconstructivismo%20filosofia%20pdf
    • http://files.joseluismartinezmoreno.com/uploads/1/3/1/1/131164568/lifukusufep.pdf
    • http://files.serendipitybathbody.com/uploads/1/3/2/6/132695551/074d9.pdf
    • http://files.picassofaceandbodypainter.com/uploads/1/3/2/6/132681885/9982836.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/bekikale.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/adventure_time_intro.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/59361551709.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/13244562698.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/37121648397.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/remove_metadata_from.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/mukasipesikomede.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/rotiriloxunukoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/kuzoxefuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/wii_64_channel.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/wawewopazumewavepabig.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/rogabosofel.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7814/files/fujomax.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/vifekor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/fiporunogezusuje.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_off00007f0e.bin
89554574b4b2cd18db1aa07afc7bcacbf8c9de1b44001ac389c93aab2332da5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 5360 bytes
font_01_sfnt_off00009140.bin
ee0c7d95c7906da97a16cdf16cc1d87ad72ba42040f7a2df3e2c9b1788df72fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9140 11060 bytes

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