Malicious PDF — malware analysis report

Static analysis result for SHA-256 15275e2b8eceeef4…

MALICIOUS

PDF

40.1 KB Created: 2020-08-18 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c611229d8190ad348948c5c6d3019f SHA-1: aaef7b69acfe97e29af859d78c67f380a0f8d392 SHA-256: 15275e2b8eceeef4fd0e37b34d301de5a35201fbc08412d289be01fafa978a3c
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a tutorial download, which is a common lure for phishing or malware distribution. The document body includes the malicious URL and numerous other links, suggesting a link farm intended to distribute malware or lead to phishing sites. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=autocad+electrical+2019+tutorial+pdf
    • http://puxivuje.scbeer.org/uploads/1/3/1/1/131164250/jifuzixisudisolavin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/fannie_mae_using_retirement_income_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/4835/3442/files/xexog.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/gusesuvojamasotabum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/4633655903.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/vukokajabowojibilegevix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/impacts_of_ecotourism.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/27171269650.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/ansi_c_balaguruswamy_free_download_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/87907045567.pdf
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/dijudabozuvivuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5262/files/46282331695.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_off00005e7f.bin
6953cee1da1d06a9484cd192a7d73fb36cea021909e3a3b6829d6787108685d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7F 5440 bytes
font_01_sfnt_off0000710e.bin
8519f705b47e51833d592337b5bc9964ff9833d96b8332b970afbd38b2fe9cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x710E 10264 bytes