Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbcab312ef7d737…

MALICIOUS

PDF

38.6 KB Created: 2020-08-19 06:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e13f7eff2e1a280d0dc2f2069726b37 SHA-1: a8fef44e8035a962bf099eb0f52110564333af72 SHA-256: 6fbcab312ef7d73756e18d2f06d356f97310230f8588c20c841a9cc22729c7a8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is characteristic of a link farm. One of the primary links, https://ttraff.com/pify?keyword=ancient+greek+dictionary, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the malicious redirector indicate a phishing or traffic-generation scheme.

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=ancient+greek+dictionary
    • http://files.katrinairwinphotography.com/uploads/1/3/0/9/130969548/gafiziwopezisumone.pdf
    • http://sevubid.senisilatcapetown.co.za/uploads/1/3/1/6/131606490/wedigexibox_xepepafo_togasafofu_gekizufemexubit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/3237167903.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/baguio_city_tourist_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/45427207516.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/list_of_subreddits.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/ratajabobavorutokunix.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/zezofegodomid.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/tesivojo.pdf
    • https://cdn.shopify.com/s/files/1/0450/2195/4206/files/treatment_of_liver_disease.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/2013_ford_focus_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/7956/3419/files/lagoki.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_off00005aa0.bin
401bebfa171658e1d1953183dc69469c924403076722a31e8da417741824eb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA0 5052 bytes
font_01_sfnt_off00006bd9.bin
e79fe31375063dc3c63918f860cb4569ce1c778bb2268386ac92e2084a911335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD9 9988 bytes

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