Malicious PDF — malware analysis report

Static analysis result for SHA-256 74984e7a9b8cf537…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e875f25cf07b0b3df313aeb21de4ac67 SHA-1: a18906c698a7471060140f202ba5156b41a2198e SHA-256: 74984e7a9b8cf537e2100e8e6d5ab152b474dc13d69ad9852fe88c2368359387
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, forming a link farm, with one URL identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous external links suggests an attempt to manipulate search engine rankings or distribute content, with the redirector indicating a malicious intent.

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/wix?keyword=grimgar+of+fantasy+and+ash+volume+4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/3070/8129/files/divefitejasawomere.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/muverolobozupepunibunedo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/somomajunifarivuvitifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70998441087.pdf
    • https://static.usrfiles.com/ugd/238140_67b4a5e42dae4ed4937d47eac49966d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_49f50439a2954bceb8847135f482ab26.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3784/files/mezaromunepudoxo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4362/4872/files/gta_v_nightclub_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/xevebutufupizixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/economic_census_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/wubadugax.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_off0000642c.bin
4bea4703692773433d0560ef40515427edf829eb8dbf6c457a168d0bc76e0549
pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 5604 bytes
font_01_sfnt_off00007721.bin
3576ef4947874639e7e71d0a568a407f27207d35400175d5ee4a54035fe163d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7721 9692 bytes