Malicious PDF — malware analysis report

Static analysis result for SHA-256 682f344548bf3a49…

MALICIOUS

PDF

41.8 KB Created: 2020-09-02 00:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79acd884025755b3afc07354de512426 SHA-1: 393f2e918a48995092c78b6cec7e1d2e7e1bfb65 SHA-256: 682f344548bf3a495d0e093a9bb301f60e56feb76a3621d45899bdfaf8550e88
162 Risk Score

Malware Insights

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

The PDF contains embedded links and a visible call-to-action button, directing users to a known malicious redirector. The document's content and structure suggest a phishing attempt to trick users into downloading potentially malicious software or visiting compromised sites. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=windows+10+activated+kickass
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/18574e_68ee28709a9a42b09e577d091d6f998a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2572a742a9284c1d91fd2df651b5b756.pdf
    • https://static.usrfiles.com/ugd/270e53_1f577e391c05450594cb1c2d68b8ebe6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e5b59c4a2642a3954808d6d017661f.pdf
    • https://static.usrfiles.com/ugd/4826f5_ca079b48a31e404aa5bacf70f6c0b70f.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/lagu_bts_full_album_2015.pdf
    • https://cdn.shopify.com/s/files/1/0431/2688/2471/files/pdf_software_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/cetogenica_dieta.pdf
    • https://cdn.shopify.com/s/files/1/0429/0271/6572/files/rationale_zahlen_addieren.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2988/files/dasegezubejipelitubaxon.pdf
    • https://static.usrfiles.com/ugd/b8c837_acfffb4ccc3644329500c1ea517f5368.pdf
    • https://static.usrfiles.com/ugd/e78b77_8ead1db0502f4afe9d7272f34f8e1152.pdf
    • https://static.usrfiles.com/ugd/b8c837_79cc6e811873480ca61b1ff00357a0c7.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_off0000652b.bin
283917f13d24287a7d29eef789c3d5383cc8e1105f0092aa7a7424bc5f98a208
pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 5228 bytes
font_01_sfnt_off0000772f.bin
9960e0a1ed9689b9d0d00e64cd1dbdcdca21636252e7b904682bd5dfee7cfe40
pdf-font-stream PDF embedded font (sfnt) at offset 0x772F 10360 bytes