Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e432663c9c20c5d…

MALICIOUS

PDF

48.9 KB Created: 2020-08-06 06:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcb24c3d32b508c30024b15e0a1a43a5 SHA-1: f70b19dcaa53513dd5104131b9262347f1b6f44b SHA-256: 5e432663c9c20c5d4d10e2cd04ed997fd8cbbb67c6e9f3c62373e64e51ee1f1b
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a resource for 'cbt for anxiety pdf' which redirects to a malicious domain. This indicates a phishing or social engineering attempt to trick users into visiting a potentially harmful website. 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.cc/pify?keyword=cbt+for+anxiety+pdf
    • http://files.50staaten.com/uploads/1/3/1/4/131454034/5519b2ec1cf.pdf
    • http://gozemudev.fbchartland.com/uploads/1/3/2/6/132681556/dadbf69b8649a.pdf
    • http://lokelopi.homewoodmb.info/uploads/1/3/0/8/130814535/112364.pdf
    • http://files.robertsheraldicknights.com/uploads/1/3/2/6/132681887/vefej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8412/8151/files/zobupugapesudubelo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/katoruzotataxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4357/files/xujekaginuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/how_to_force_pull_git.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/81252819799.pdf
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/calendario_biodinamico_2020_espaa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/644038943.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.pdf
    • https://cdn.shopify.com/s/files/1/0428/5648/0935/files/degitilotumarekivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/fozegojolefepik.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6762/files/44748204204.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/sistema_reproductor_masculino.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/argandoa_macroeconomia_avanzada_2.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_off000082a8.bin
a8a67d40743f4ef9b1e1fbcd316ad4ee6118bee50d4c9b936e5397388b7b3a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x82A8 5040 bytes
font_01_sfnt_off000093de.bin
9db533ea95a00a17610609e9cdd6da9a81e785e6c53c203a421c87dfd9a8800f
pdf-font-stream PDF embedded font (sfnt) at offset 0x93DE 10284 bytes