Malicious PDF — malware analysis report

Static analysis result for SHA-256 0483699767f647f0…

MALICIOUS

PDF

44.0 KB Created: 2020-08-23 06:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eae6ea443bb985c5bd5583bbf8516593 SHA-1: 92c0a4db2a652dab6267db62c63044d8f6a883f4 SHA-256: 0483699767f647f01ccb61b18dca66df65c1d1af5b466f9823d8815ee9aee109
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 a link farm designed to mimic search engine results for software downloads. One critical heuristic identified a link to a known malicious redirector, suggesting the intent is to lead users to malicious websites. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=kindle+app+windows+8
    • http://tapazaj.dwmarshallbooks.com/uploads/1/3/2/6/132683014/remobe-xanabuxefe-ronina.pdf
    • http://files.youngstiling.co.uk/uploads/1/3/2/6/132681482/fewovulibezumuvegem.pdf
    • http://files.bct1379.com/uploads/1/3/0/9/130969446/dafawozigi.pdf
    • http://files.fairfieldtaxpayer.com/uploads/1/3/2/6/132695714/fbc8ab742.pdf
    • http://vufud.kmid.com.au/uploads/1/3/1/6/131606156/2150784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/tamasha_full_movie_moviescounter.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/77274604437.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/rawaxigosiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/19011720263.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/81547496894.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/13506773068.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/tuvozanokov.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/l_carnitina_bula.pdf
    • https://cdn.shopify.com/s/files/1/0435/6793/9743/files/14921328350.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_off00006f11.bin
013e77598561ad8972dd995e0ceb96ee4452dc808f39db9b72f3f291a9c064e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F11 5112 bytes
font_01_sfnt_off00008094.bin
968cb45fe676b6da5292cda789275d06af80b458ab73b8c4fbcb8ceb7bee8013
pdf-font-stream PDF embedded font (sfnt) at offset 0x8094 10228 bytes