Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b7cdef31227e1f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-25 13:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a8f4e530fb3310544e65b2d79b5920f SHA-1: 3f36a1d09f51bdea50d05c47fdb974d111801e6c SHA-256: 78b7cdef31227e1f1b8ba32f5e1b84510dd285f88eac0c3f49306b760d76ac04
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body also contains this URL, suggesting an attempt to direct users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to other PDFs, some of which are hosted on potentially untrusted domains.

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=best+android+phones+2018+cnet
    • http://files.rudolfiartworks.com/uploads/1/3/0/8/130813692/disutuwisi_tapedelopujufa.pdf
    • http://xakigemup.dmlaser.com/uploads/1/3/1/4/131483281/5318506.pdf
    • http://tavanarix.kpcecala.net/uploads/1/3/1/3/131383770/kitafituvozowusale.pdf
    • http://files.blacktomatoesinc.com/uploads/1/3/1/4/131438175/mujixadezusegixeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7389/4555/files/dysfunctional_uterine_bleeding.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/anlise_financeira_fundamentalista_de_empresas.pdf
    • https://cdn.shopify.com/s/files/1/0438/1802/5122/files/26300235796.pdf
    • https://cdn.shopify.com/s/files/1/0448/1200/9634/files/73335016944.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/towidemafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/wupavedifuka.pdf
    • https://cdn.shopify.com/s/files/1/0436/0303/4276/files/daguzuxorejaseraridiroru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1664/files/xakovonafari.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/sozelezini.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_off00006230.bin
c49bf8ed35c8a32fd41ba21df5e48e82127c4f24d41d0282fcb990a51fdb3b50
pdf-font-stream PDF embedded font (sfnt) at offset 0x6230 5696 bytes
font_01_sfnt_off0000758b.bin
567a085a2817086ec6a4c1d011aeb5f6d76b9c3dea37f266bb0a70ac43327b89
pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 10152 bytes