Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c8ff25a7b7c54f…

MALICIOUS

PDF

57.0 KB Created: 2020-08-10 21:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a922a28104748f423c36d47124af771e SHA-1: 84fa13b07d0ac91a0fa10cbadae9f74a97e1c159 SHA-256: a1c8ff25a7b7c54f5ff7e1a99053521ed2ebeb0073c3194ec1d4b25765e39e68
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for delivering malicious payloads. The document body, though heavily obfuscated, contains text related to an admission exam, likely serving as a lure. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm for SEO poisoning or to obscure the final destination. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=examen+de+admision+ceneval+pdf
    • http://files.marineoasis.com/uploads/1/3/0/8/130813866/vogusuromipefer-jerogi-fulusenakebi-jojixefuga.pdf
    • http://files.kmphotographyma.com/uploads/1/3/1/4/131407165/1126974.pdf
    • http://files.theimpactexplorer.com/uploads/1/3/2/3/132303278/togunukewanono.pdf
    • http://bejoro.thewanderingbays.com/uploads/1/3/2/6/132682883/givofufabumowukap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1416/files/rapoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/fadirisijurugex.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/silent_letters_esl.pdf
    • https://cdn.shopify.com/s/files/1/0449/5107/7032/files/el_alcoholismo_en_los_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/jodujugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8515/1897/files/45370782234.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/94234398760.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/sisalememofiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/13892978814.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/wudafetaluzoweta.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/28606983057.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/59173401639.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075fc.bin
7e7ef3190fb394af45f3094e4e7e723eab2ab4c70c2760b28b0076514641bc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 5292 bytes
font_01_sfnt_off000087f4.bin
e9f8a3ef788f0cbd16162dfcacf3538d4d9f72d83e44e67f72eb93bd53224865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F4 1912 bytes
font_02_sfnt_off00009123.bin
df222da38282f2b0235ef9957a3898421a9c2368685a532bb322030182db555c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9123 14744 bytes
font_03_sfnt_off0000bee3.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE3 16312 bytes

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