Malicious PDF — malware analysis report

Static analysis result for SHA-256 78476c05b5846ad5…

MALICIOUS

PDF

76.3 KB Created: 2020-08-14 05:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea58cf82b07ac05ef1548576d1fd9270 SHA-1: 5df728ab6227ea6d4a7dbfb8f3e559c61d82dcc8 SHA-256: 78476c05b5846ad5e8cbcd174e9ffe76d2b440f6dca8170b1ee65cec89417867
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=speech+writing+format+isc+class+12
    • http://fomag.elliemartino.com/uploads/1/3/1/3/131379246/7537338.pdf
    • http://pudozu.hyojinlee.com/uploads/1/3/0/7/130739704/wujez.pdf
    • http://files.brazossunrisefarms.com/uploads/1/3/2/7/132740997/ea0d50e52d6705.pdf
    • http://titope.frankpaino.net/uploads/1/3/1/3/131383664/7a57ad9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/ridgid_air_compressor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/wexadarovapet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/jufasutorineserotagow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/baxumaxamajure.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/foremolobotevuludaxuninu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/71169997612.pdf
    • https://cdn.shopify.com/s/files/1/0449/9944/2590/files/sweetbitter_stephanie_danler_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2806/files/30389135326.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/english_opposite_words_list_a_to_z.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/zoxosidojemorudawupe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6901/files/fidefodimaluf.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec74.bin
03c525d6ca48c50966c814ce1774e7dd078d3bc3c4e572b85fd6da12018d1e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5808 bytes
font_01_sfnt_off0001002a.bin
13590bdcabea49b1ba81ab11ecdef296d80c2359968bc55b9c30198eed46c0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 10576 bytes

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