Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aefdcece0dec1e2…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 09:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad112058626a80a510acdb4a52ea568 SHA-1: 545cb3a8a3c3272acb2669f7c7477b53050fd8a2 SHA-256: 0aefdcece0dec1e286dc94b7020a3e7cacba26b63ea0ba6d9547a4eaa06e4714
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm used to obscure the malicious redirector. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/pify?keyword=camstudio+9.+1.+0
    • http://files.leesvilleroadxc.com/uploads/1/3/2/8/132814168/1242402.pdf
    • http://zaboz.quik-smog.com/uploads/1/3/1/8/131857631/9486541.pdf
    • http://dajix.liquorburn.com/uploads/1/3/1/8/131856462/petawogezozazekuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/72964508236.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/medicinal_chemistry_of_anticancer_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/27184431149.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/12183778921.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/bella_ciao_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/risut.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9782/files/ramadan_calendar_2020_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/57638218782.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/40410445607.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9308/files/niv_cultural_backgrounds_study_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5861/files/jasevaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/biocombustibles_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/84457232156.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_off000061b4.bin
799327f707f21cba303f8596ce1e29bd0e42d7804a86b0394ae2c496fb727b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B4 5128 bytes
font_01_sfnt_off00007319.bin
31540c98cb566a83e03dfb1f23b9ce3ba11cef66f6cf92a1e7a3a0119fed5798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 10580 bytes

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