Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab38bd535485d193…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 20:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a57c38d3e1aec690ee9e6768f8b03b9e SHA-1: ff9423d24d28b7653b177d857be6b72c9fee601b SHA-256: ab38bd535485d193e4f53116148adad374f207c62cff1b9133f53a3e1ef62515
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a malicious redirector disguised as a 'Lundbeck annual report 2009'. This indicates a phishing or social engineering attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the malicious redirector are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=lundbeck+annual+report+2009
    • https://static.usrfiles.com/ugd/2074c9_4f7771a92d404cbaa5ced7021443d09f.pdf
    • https://static.usrfiles.com/ugd/a382ee_872624294fa54458950d1a4ea18fe2f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0490332ced44525988ae3e4ed2cb481.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ad1b897190417794d4720556388221.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4254/files/busumabip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/pre_calculus_12.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/25117179181.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/aihwa_ong.pdf
    • https://static.usrfiles.com/ugd/5ecadc_9aa4c23eacd4424fb02ef0964090877d.pdf
    • https://static.usrfiles.com/ugd/b8c837_820a5227004c441c8dc8a2499c615489.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_off00008736.bin
7fd799f32135135782aa19394971d4633b46979295a31cd9f302cdc4044eef0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8736 5464 bytes
font_01_sfnt_off000099d9.bin
1b08beebe0f3bd3318c38fd97105cb791234d95ac3e874f49c377126ca1bcbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D9 10620 bytes

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