Malicious PDF — malware analysis report

Static analysis result for SHA-256 e558479a7afe359b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 01:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a459c8adf28d38dce50b38778dbb85 SHA-1: ec0fa212b3ba0a60fecc904769471c1a23bd6d50 SHA-256: e558479a7afe359bf814981e9d7efdda793d97f5160bb83577207b6e20cbe499
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=due+date+for+tax+audit+report'. This indicates a phishing attempt, likely to trick users into believing they need to address a tax audit. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The presence of numerous other PDF links, many pointing to unknown domains, further supports a link-farming or redirection-based attack. No scripts were extracted from this sample.

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=due+date+for+tax+audit+report
    • http://ralen.lincolnperformingarts.com/uploads/1/3/1/4/131453540/cf4b5432deb.pdf
    • http://pison.withoutbordersshop.com/uploads/1/3/0/9/130969341/9632269.pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • http://ruvidumo.d15mea.org/uploads/1/3/1/6/131606490/9489612.pdf
    • http://files.artsindustryalliance.com/uploads/1/3/1/0/131070402/pedomu-bavuvofubuk-sufesidonog.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/biochemistry_by_lehninger.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/63081817952.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5745/files/understanding_business_nickels.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/58514604548.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/74774475098.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/tiwawukazolon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/41221869725.pdf
    • https://cdn.shopify.com/s/files/1/0432/0146/2436/files/xunuzuxe.pdf
    • https://cdn.shopify.com/s/files/1/0445/6343/1588/files/sociology_optional_for_upsc_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0875/files/52895474124.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/apa_style_citing.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_off000070fd.bin
1c72fd355e89347077ecc08937943e75442c5b6386a8a429c8683ba7c53de646
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FD 4892 bytes
font_01_sfnt_off000081c0.bin
82b978f32ed8f4787bf2ad22c1d640dabef5d79810a716fb70214dc8b68a985c
pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 10580 bytes