Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccdc90ceb2b5beb…

MALICIOUS

PDF

37.7 KB Created: 2020-08-22 21:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb7c5b211db910442736f9a6700eb38e SHA-1: 79c06df3161a421878bd621ad4bc382b9c280af9 SHA-256: 5ccdc90ceb2b5bebeb1924d03908298866ec8214b018080efe5a1259cf8b6dba
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body and heuristics indicate a social engineering lure to install a browser extension or update, a common method for malware delivery. The presence of numerous links, including a link farm, suggests an attempt to distribute malicious content or engage in SEO manipulation for traffic redirection.

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=fb+video+er+hd+quality
    • http://vutuba.royalmarineser.com/uploads/1/3/1/8/131871787/zamazarasa.pdf
    • http://files.hundojaya.com/uploads/1/3/1/6/131637853/kafuterutalep_xumoxuvewa.pdf
    • http://files.findingfryston.co.uk/uploads/1/3/1/4/131407547/7843120.pdf
    • http://files.salemll.info/uploads/1/3/0/8/130873715/netofebap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/41166127495.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/sovukewakaxile.pdf
    • https://cdn.shopify.com/s/files/1/0435/2091/7668/files/niguduvutuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/23723156628.pdf
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/76105750485.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/the_economist_november_3_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/64911531408.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/83427639964.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/barrierefreies_bauen_din_18040.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/ecological_and_economic_importance_of_bryophytes.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_off000056bc.bin
9a5d1c26a31831b201c075cb83a8cf5316c4e5636ab2178b173e7ef4ad6f02ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BC 5116 bytes
font_01_sfnt_off00006825.bin
322871f6ecaf42bedfa5b4f57c13389c5713a94dedd9ed23fe9dedcf6e740ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 9900 bytes

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