Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c711a777a5e7b62…

MALICIOUS

PDF

41.7 KB Created: 2020-08-14 08:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 459920c1512ed541dc94a2d86cc9f845 SHA-1: 3d26a1c6e5388b9227e8636be4bfbc3827c2732a SHA-256: 5c711a777a5e7b62e037a693326782d99a5d65986157881ba5ae130ef3b31195
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting it is part of a link farm or SEO poisoning campaign. The document body, though obfuscated, contains the URL that leads to the malicious redirector, indicating an attempt to lure users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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=the+seven+value+stream+mapping+tools+pdf
    • http://files.apolloartists.net/uploads/1/3/2/6/132681851/3866484.pdf
    • http://files.katiegracecollins.com/uploads/1/3/0/7/130776276/wudupufube_sididoli_romexugowa_suwuxo.pdf
    • http://files.ccmein.org/uploads/1/3/1/6/131607075/xusitodizej_benipizabu_bidewolegin_zarela.pdf
    • http://files.johannaparkhurst.com/uploads/1/3/1/3/131383754/virepez-furedoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/93162202875.pdf
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/25557951527.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/wobowurovutosevesawoxukip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/jesasugitav.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/96126238850.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/3976328712.pdf
    • https://cdn.shopify.com/s/files/1/0449/7424/3999/files/amulet_book_4_read_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/best_voice_reader_for_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/55057168355.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/wulujegezusisuxagibuv.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_off000064a6.bin
8ef8efc16b8b3bd24ffddbd8227c954cdb7f60ed63fe4b3b9f681caf373da0ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 5464 bytes
font_01_sfnt_off00007716.bin
faf98557ec85e34368b50af7a022dabe4e5edd44a9ba360ba407ee44dd4ad50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7716 10268 bytes