Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98f636b13d8d17e…

MALICIOUS

PDF

42.1 KB Created: 2020-08-24 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d79897a6f924b7e741d63d2c03f0ed7 SHA-1: 9afdde7fab068c8c12bf09d18b4868c38c34b5d8 SHA-256: a98f636b13d8d17e86dfcf784950bac17a6eb7608d6c7ea7393ba95c38964a34
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised as a public lighting report. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits. The document body, though heavily obfuscated, contains the malicious URL and several other URLs hosted on Shopify and other domains, likely part of a link farm to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=reporte+alumbrado+publico+merida
    • http://vabosof.cruisesceptic.com/uploads/1/3/1/3/131380485/bukuzabu-gezavinubob.pdf
    • http://files.patdbuchananeportfolio.com/uploads/1/3/2/6/132695302/lumifokimotutokevez.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/ragidomazim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/mijelarew.pdf
    • https://cdn.shopify.com/s/files/1/0441/3584/1944/files/denurewugavekasuvupusigij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/60447133071.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/62302603461.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/52469004977.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/vukafuwixegojawapuna.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/51687737814.pdf
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/49579739010.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/vilixenepilorefefifeleb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/aapc_cpc_study_guide_2020.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_off000061c0.bin
3431d82f448d6fcabc265f360c652983648b7b1008642d872d0ddb9af6b747fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 5188 bytes
font_01_sfnt_off0000734a.bin
6995f36ce1df280c33dd214b3aede20c6561d7cae82cbee6ccb7fd429993f78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734A 11976 bytes

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