Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdff689353954ae7…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 09:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371038e2297c77a39d6a99413bdc8430 SHA-1: 7e020abe652f6c5880fce2ac345d711bccee3ec7 SHA-256: fdff689353954ae79cf807d5dcb08f19e45c03b42661647223934e9dba85a42d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the link farm and redirector suggest a delivery mechanism for further malicious payloads.

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=cephalosporin+generations+pdf
    • http://files.gospeltrumpet.net/uploads/1/3/1/3/131384573/2807409.pdf
    • http://files.gamescapesf.store/uploads/1/3/2/7/132740343/23359.pdf
    • http://files.btaccountingandtax.com/uploads/1/3/1/4/131406506/3e84b9da97c814.pdf
    • http://files.framemysore.org/uploads/1/3/1/3/131384789/7349004.pdf
    • http://files.shamanicpathandpractice.com/uploads/1/3/2/6/132695836/xoninosojo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/farmall_cub_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/lenavaduwijuzibazef.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/vivurexukugukoru.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/72352243463.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/58608966249.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1480/files/84181251982.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4665/files/80395772970.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/josov.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/wixawobeziripunomejil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/jugakanopuvugas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/memetamogopani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/56708218744.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_off00005ab5.bin
9186b779e4167f9fcc2e090ff57aea6ae29230a94e38b2ca115be354c5fe36a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB5 5208 bytes
font_01_sfnt_off00006c61.bin
eedfee4b597daaa35981059e4a64588dcb61c03e90c69273070c0fb68c647c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 10420 bytes

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