Malicious PDF — malware analysis report

Static analysis result for SHA-256 0076c17ffea795d1…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 22:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a0a762d3673a6fed6d5374485b0cd33 SHA-1: 8a7b534a9b7789852ceadf3d360d8d4a1df5b6fc SHA-256: 0076c17ffea795d18274aeb3e78c75a39bafe59c70b0bd092e27611fc4d82d7b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=reading+fce+pdf, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains this URL and other URLs that appear to be part of a link farm designed to lure users into clicking malicious links. The ML classifier also strongly indicated 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.cc/wix?keyword=reading+fce+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1537/9880/files/switzerland_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1334/9273/files/29424536557.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/naina_barse_rimjhim_barse_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/calculus_briggs_cochran.pdf
    • https://cdn.shopify.com/s/files/1/0434/4083/2678/files/75504075826.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/gojed.pdf
    • https://static.usrfiles.com/ugd/b8c837_010d7a20908c40c0b5541ef180ae64c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_10ab946123994a39810bca2c818de36d.pdf
    • https://cdn.shopify.com/s/files/1/0435/5869/9171/files/c_mcq_questions_and_answers_online_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/31135241248.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_off00006841.bin
891d8c29e1232dd06577f1bce227af1b0a346370ed93bc23d84bc2d11632a193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6841 5024 bytes
font_01_sfnt_off00007972.bin
f4bd3c9e9f5837447563dff932c62f3969b5cdd99a4e94cd0f5e12619dd2f8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7972 10352 bytes

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