Malicious PDF — malware analysis report

Static analysis result for SHA-256 76da954e09e233f7…

MALICIOUS

PDF

38.3 KB Created: 2020-08-12 23:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a306dcea4e71a1d4606ed47eeafe798 SHA-1: 676bcc9d2ae51057b0a3b95ccc751d0d8722c5d1 SHA-256: 76da954e09e233f7568b05ec1f68c1c0e275fa5cfa08f077b1ae4d419ce11c46
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 Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content or for SEO manipulation.

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/wb?keyword=libiamo%20ne%20lieti%20calici%20pdf
    • http://files.centertowndfw.com/uploads/1/3/1/3/131383480/rakakogaxogopegigip.pdf
    • http://files.britishbanterinatlanta.com/uploads/1/3/0/8/130813373/rukepimalag.pdf
    • http://files.tankenterprises.ca/uploads/1/3/0/7/130775380/pomevabanaze_noxiganuwaza.pdf
    • http://zebos.patrickwboyerjr.com/uploads/1/3/0/8/130874222/sadenuvuzexedepamas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/vapira.pdf
    • https://cdn.shopify.com/s/files/1/0428/0074/2567/files/94338204275.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/43304538412.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/cafe_creme_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/bratstvo_crnog_bodea_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/32973971286.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/wuxoxamuxetaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/kumaluxilav.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0623/files/bronx_zip_code_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/regal_cinema_mccain.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/96196390733.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/adrenal_gland_function.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_off0000550e.bin
32692a502b1a8ee72f463ba960032f4ce7f93545bd9e3a32468b56ecc1402b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550E 5108 bytes
font_01_sfnt_off0000665e.bin
e500dd1940e4a6ab842cf304dd522a379dfe7e040c02e0051b1e00f6200113d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665E 10772 bytes

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