Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ccbab6ca7be4fb…

MALICIOUS

PDF

41.8 KB Created: 2020-08-26 05:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8757d82714861d0bea8c994ea70d503a SHA-1: 84b18eb160ab145d7761769c0d8c13fddfabd636 SHA-256: 06ccbab6ca7be4fb3b7f0248a3f268d90cf500a91c946d7232ea190bf326f604
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic, which is likely used to obscure the final malicious destination. The document body also contains the same URL, suggesting it's the primary lure. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, many pointing to benign Shopify URLs, likely to improve search engine ranking for the malicious link. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect the user.

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=download+big+sean+album+free
    • http://files.expeditiondrenched.org/uploads/1/3/1/8/131871739/jodisaviropebifu.pdf
    • http://files.chrismhoward.com/uploads/1/3/1/1/131164314/taborimokolisido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/17799153626.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/23272825158.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/bamboo_daal_ke_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/8173/6096/files/lidadakelur.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/bsc_new_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/serer.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/free_donation_form_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/sazarusoguwufe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/biwiso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/98147188921.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/45742162458.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.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_off00005cac.bin
ff9e0f1247b50047022c7b3b9a82c91fa4eb18120e486ad767ca284b952a4a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 5460 bytes
font_01_sfnt_off00006f33.bin
83c58c50a819c4d9b1b1e5cf0f45b17cbc26fc042b1ced018ce00a8c764db239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 13444 bytes

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