Malicious PDF — malware analysis report

Static analysis result for SHA-256 9878c5d2e32b7af7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 08:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7364a556dd965efbad46df94e8b0e35b SHA-1: 5decbdf8b148d1af0acbce176337271c496b2897 SHA-256: 9878c5d2e32b7af74ce97836c03cb09c5d54777c90b7b32bf26ff21633874328
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic firing indicates a PDF redirector link to 'ttraff.ru', which is known malicious infrastructure. The document body, though heavily obfuscated, contains text referencing 'Battlefield 1 license key.txt' and the malicious URL, suggesting a lure for users seeking software keys. The presence of numerous SEO-like PDF links further supports the idea of a link farm designed to attract traffic to malicious sites.

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.ru/pify?keyword=battlefield+1+license+key.+txt
    • http://logudago.amoclarity.com/uploads/1/3/0/7/130776257/jewivemibe_sibedoj_rimedorijow_vabatisonik.pdf
    • http://files.reframephx.org/uploads/1/3/1/4/131437770/lagefeg.pdf
    • http://files.lawrence-writer.com/uploads/1/3/1/3/131383838/nezodubu.pdf
    • http://files.360pro.be/uploads/1/3/0/7/130776120/nuponek.pdf
    • http://files.bwstook.com/uploads/1/3/1/4/131437683/410264.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/kukolavuwenitumenum.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/cytology_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0448/9153/7563/files/how_to_write_bold_in_whatsapp_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/6860/5095/files/cub_cadet_50_inch_zero_turn.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/14509651802.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/84664877774.pdf
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/test_de_autodiagnostico_del_emprendedor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/breath_of_the_wild_shader_cache.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/chomsky_normal_form_converter_java.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_off00005b1c.bin
9b409f13e58c0c5ffa21b27e5cf13cb0e1fb46a259233d3f275916bb31d0c7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1C 5284 bytes
font_01_sfnt_off00006d41.bin
985f950a0e1c86f53635b2b36603a84c48d529ba5da31de69938a09ab4b372e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D41 17632 bytes

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