Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaea5545f8e75f56…

MALICIOUS

PDF

37.6 KB Created: 2020-08-13 12:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d13e6eb92a522145141a1ab3803a8c8b SHA-1: c809416d727f175b16790d055e081637fb0aa50e SHA-256: eaea5545f8e75f56057b6c32500e5a6d792db80ad457c374164c6a63a1ebc54d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=past+simple+regular+verbs+exercises+pdf+islcollective'. Another heuristic indicates a PDF link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation. 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.ru/pify?keyword=past+simple+regular+verbs+exercises+pdf+islcollective
    • http://files.arttalkcollective.com/uploads/1/3/1/4/131409009/9013369.pdf
    • http://files.delisodidit.com/uploads/1/3/2/3/132303061/vujosuxopibik-karimuzosososis.pdf
    • http://xusuxa.forasiacheersfoto.com/uploads/1/3/1/4/131407535/4334601.pdf
    • http://files.slopebrookfarm.com/uploads/1/3/1/0/131070450/6726060.pdf
    • http://files.palladinohomeinspection.com/uploads/1/3/1/3/131382346/tugazajofox-vedubanaz-fumeruni-vudegul.pdf
    • https://cdn.shopify.com/s/files/1/0440/8567/4149/files/soporewin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/beginners_guide_to_digital_painting_in_photoshop_characters.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/95309491606.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/bank_clerk_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/49726278015.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/59810445729.pdf
    • https://cdn.shopify.com/s/files/1/0429/6540/1753/files/57713788946.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/44060212079.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/kefinewijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/kubakosixuvarutizirulewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/curso_de_ingles_para_principiantes_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/bivufunizekamopalak.pdf
    • https://cdn.shopify.com/s/files/1/0429/0904/0803/files/kosizodopumilezijataxu.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000471e.bin
18074ce5290ed7de2ab0d21200922406aadaedcf7a4f562a50fbfb1c8ef5b08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471E 5520 bytes
font_01_sfnt_off000059e6.bin
1287cea68692d465507881ba16eb08e5ddead98541141243c37a119dda0d10ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E6 9676 bytes
font_02_sfnt_off00007af9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF9 4324 bytes

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