Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ccef62527a14df…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 09:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6beb48234cbfede8cd73b3df6062f0d8 SHA-1: 4a0fae7b7615bee7dd15e8304480a06ddcd1043b SHA-256: 09ccef62527a14dfe4a3274910d1006dc73c56b391182f4e84ca49c8a7bf6d41
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 of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links, https://ttraff.ru/wb?keyword=ryszard%20engelking%20general%20topology%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this malicious infrastructure.

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/wb?keyword=ryszard%20engelking%20general%20topology%20pdf
    • http://files.thecrunchychickadees.com/uploads/1/3/1/4/131437676/621181.pdf
    • http://files.anamnostoshouse.com/uploads/1/3/1/4/131408930/f811f17d1c84.pdf
    • http://files.pallavisastry.com/uploads/1/3/0/7/130738559/fenigis-polede-wutaloma.pdf
    • http://files.citykidzmag.com/uploads/1/3/1/0/131069839/fobosewig.pdf
    • http://files.hookingforthehomeless.com/uploads/1/3/0/8/130874143/gajijupavejexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/maweratoselirixetivejebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2432/files/7394218682.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/23896487368.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/tijobizariz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7287/0807/files/kuriwogoreluvusoresoda.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/vengeance_sample_packs.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/gejorazewilugazojirexedem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/deguminusaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/luleraga.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/37005342535.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1077/files/xomejobezanam.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/13372025890.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_off000064b6.bin
751237bf3bdd9afc0e4ec92ebd4f46afea5821bb9f55e0a419351c9e3a85c32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 5432 bytes
font_01_sfnt_off00007761.bin
3bdb971ae29aab8aa8431f6cae7a52203c4aafc53ae2a45e986173fd3b721899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 10084 bytes

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