Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b8e2c70f656759…

MALICIOUS

PDF

34.7 KB Created: 2020-08-31 11:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b59b0f1cceb64e2944fb8c75aab65e SHA-1: 6f7a9189a8b377be5a5722d17a18456943ac6f9d SHA-256: 40b8e2c70f656759104c90391adf32fa19d776401a0cb9336147cee18d5fe164
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious domain, disguised with a lure related to free movie streaming. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL strongly indicate a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.com/wix?keyword=watch+despicable+me+online+free+megashare
    • https://static.usrfiles.com/ugd/99a8f2_6dd76db202124a6c950cfaacd7019c56.pdf
    • https://static.usrfiles.com/ugd/b8c837_85fd286eb104497b837e2f05c53a66cb.pdf
    • https://static.usrfiles.com/ugd/6d59ab_32540b68c829463fa1bf2395ea0add75.pdf
    • https://static.usrfiles.com/ugd/64d889_73e2705fafe24bbfb760b9c2caf37dbb.pdf
    • https://static.usrfiles.com/ugd/77941b_20235e00579d4efaafc379fbd37f9789.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/xiwujuvepagus.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/74833315205.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/banking_terms_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/7253170147.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/vijofagifado.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/itemized_deductions_worksheet_excel_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/60911106441.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/23267523528.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_off0000498d.bin
558cc24acac87c8f0854c48c6194d0786c4412df24033cde8aa9f0eb8e1a1095
pdf-font-stream PDF embedded font (sfnt) at offset 0x498D 5724 bytes
font_01_sfnt_off00005ce7.bin
e0bd95bbb51dbb9df07790ee80272dad848afc4602159ef2de9eb8bef11a2589
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE7 9692 bytes