Malicious PDF — malware analysis report

Static analysis result for SHA-256 4654970a33fdf6cc…

MALICIOUS

PDF

54.9 KB Created: 2020-08-22 03:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ac89dc8a2d3569a4c2d41ee85cdf782 SHA-1: 082f7a2d9a0f0d2e417c067f3d8a1413620761c2 SHA-256: 4654970a33fdf6ccd21ad8130fd1137c04bb0db63e58acf88f4cfe4bbc508831
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm' containing 30 external PDF links. Another heuristic flags a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to click on these links, which likely lead to malicious content or further infection stages.

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=new+emotional+status
    • http://files.enviroaesthetic.com/uploads/1/3/1/3/131381640/zorodoliwotividuse.pdf
    • http://mekafifal.red-bean-coffee.com/uploads/1/3/0/8/130814526/dotinidavutil_lowigipasozad.pdf
    • http://files.jrsfineart.com/uploads/1/3/0/7/130776255/zonadikaroxiw_luxur_xexilidaviti_tagegegun.pdf
    • http://teleki.bedfordbiblechurch.com/uploads/1/3/1/8/131857252/ea8b0.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/python_script.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/rilijidosapapaxarexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4449/files/bitilemebabebij.pdf
    • https://cdn.shopify.com/s/files/1/0463/6557/3275/files/estandares_de_calidad_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5554/files/titovipezadabadafiroke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/basic_computer_skills.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/uli_cable_tray_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4578/files/genetics_book_by_pk_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8847/files/39856148324.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/levefotin.pdf
    • https://cdn.shopify.com/s/files/1/0437/4616/4897/files/tibupiterenukejulet.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/disulagogosag.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c0e.bin
071165b5a3019812367f5704a9d842ec4c26fdae8f0597ec1434366efa04474c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0E 4796 bytes
font_01_sfnt_off0000ac58.bin
5ec36e716209f4ef4ce5ba38262a8c04c9523ede835af3231c72fda904f37696
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC58 10016 bytes