Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c6dc5ece156ef0…

MALICIOUS

PDF

50.0 KB Created: 2020-08-24 20:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28586f53aa9075c35d00518e39e2e95b SHA-1: 64020e0d8ecebb37b2dc6223516d9ee73d4b5368 SHA-256: 28c6dc5ece156ef0ce7662947b3985f5c5531469758c3dd6c83c439bc20a67be
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains a URL that matches the redirector. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

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=circus+britney+spears+song
    • http://files.experiencetheport.com/uploads/1/3/1/8/131856356/zadinasefit_mavutixuxojulud_vimol.pdf
    • https://cdn.shopify.com/s/files/1/0439/2891/2040/files/adda52_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/kumolisozegukiru.pdf
    • https://cdn.shopify.com/s/files/1/0466/6402/4229/files/instagram_insights_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/analise_de_dados_favero.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/kaxexebozudomezumijodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/blue_eyed_devil_lisa_kleypas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/lerevom.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/32036198335.pdf
    • https://cdn.shopify.com/s/files/1/0464/7665/6790/files/lomolamebosegepifufozine.pdf
    • https://cdn.shopify.com/s/files/1/0437/7621/3141/files/85171542349.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/swimming_pool_design_and_construction.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/wudogelozuriwinoxofupurej.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/wudoxin.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/
    • https://cdn.shopify.com/s/files/1/0439/6656/24

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008625.bin
daf263ad5890fca0a780abfec4ce7ab7e57ac669c42a3225a796b7b68ccd8712
pdf-font-stream PDF embedded font (sfnt) at offset 0x8625 5216 bytes
font_01_sfnt_off000097eb.bin
da13cd3ec82b5b1486b93518113730522e1b72b1c609c30367473a43ca486f28
pdf-font-stream PDF embedded font (sfnt) at offset 0x97EB 10308 bytes