Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33d9ed7c633081f…

MALICIOUS

PDF

66.9 KB Created: 2020-08-11 23:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f92f421fd7c82413feb317047d01d51c SHA-1: 033ccdf3ea26816be11d8d1b5db88041b5581411 SHA-256: c33d9ed7c633081fd42c9dc4a8dc18f7238a449d05120cf0bf13e57c881b2e1a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=download+surat+ar+rahman+latin+pdf'. The ML classifier also strongly indicated maliciousness. The document body text appears to be a mix of metadata and a lure related to downloading a PDF, further supporting the malicious link farm attack pattern.

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=download+surat+ar+rahman+latin+pdf
    • http://files.graysondel.com/uploads/1/3/1/0/131069879/kurowo-juzevesodi-lopisubabefemax-bodomixusezol.pdf
    • http://files.camanchemobilehomeparks.com/uploads/1/3/1/3/131384145/fefizojepopubatidake.pdf
    • http://files.benbodnarfilms.com/uploads/1/3/0/7/130738614/rikivenejovur.pdf
    • http://files.trufflefarmsc.com/uploads/1/3/1/4/131453333/3550967.pdf
    • http://files.sweetbakeschicago.com/uploads/1/3/1/3/131398140/zelaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/tifijokikaxikupuwuzuxon.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2961/files/d3_js_heatmap.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/42616870746.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/vefasenanujigup.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/topogutapidarifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/factores_sociales_definicion_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/kuderosijopaxadaves.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/kedudexoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/koboxutog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/19906128481.pdf
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/somir.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/fapiwokataxijilovozetipug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c469.bin
e758d9749cd012d0bcf71bf55623947e89b6b92b8b9692019c92de7b87e0899d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC469 31352 bytes
font_00_sfnt_off00008ec7.bin
20babd397a00f8f74533f73441ebf837fc26f69f3de6f6cf98d2b648f223ba3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC7 5372 bytes
font_01_sfnt_off0000a0f7.bin
b45d94915eaa70eee5f0c05c0a2802f6eadcf271252a6b3b7045e2310cd43b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F7 11076 bytes

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