Malicious PDF — malware analysis report

Static analysis result for SHA-256 337782a58a44e56c…

MALICIOUS

PDF

44.6 KB Created: 2020-08-22 15:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d293cbdfd302394e9ee8865621a283d1 SHA-1: 5d9d8c1d902fcf21af9fb390cf62f34a0018cd71 SHA-256: 337782a58a44e56ce35634204edddd8dd24019bca0accc8eeaaffc2c948d1c94
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 of these links, 'https://ttraff.com/pify?keyword=bootstrap+4+layout+templates', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'bootstrap 4 layout templates' and the wkhtmltopdf application, suggesting a lure to disguise the malicious links. The primary attack pattern involves redirecting users to potentially harmful websites through these embedded links.

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=bootstrap+4+layout+templates
    • http://files.anewbeginningpreschool.com/uploads/1/3/1/4/131407299/pigode.pdf
    • http://files.hepatitiscmsg.org/uploads/1/3/0/9/130969300/930030.pdf
    • http://files.gracebibleministries.com/uploads/1/3/1/3/131398224/4933051.pdf
    • http://files.jenniferrosengarten.com/uploads/1/3/0/7/130740044/padoto.pdf
    • http://xiluxop.nuodphi.com/uploads/1/3/0/8/130813835/6749592.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/lefuvagonefudaxifirifepuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/selasabisenusigejulipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/55821875043.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/bryan_adams_run_to_you_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/39120195258.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/66147171136.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/best_zelda_songs.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/36180352165.pdf
    • https://cdn.shopify.com/s/files/1/0439/4303/5048/files/435-_310-_9009.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/85104300368.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/aparatos_de_ortopedia_dental_infantil.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_off00006851.bin
585d9cf446a5ecc7a600aeb92dd2a2eb1e33bb1ddd3a8251508c77230554a4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 5204 bytes
font_01_sfnt_off000079fc.bin
b854d88189b9e51713899252f9815ba981beaa1fa76240f1f6d47b4aad02c4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FC 13952 bytes

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