Malicious PDF — malware analysis report

Static analysis result for SHA-256 f544e3587eddb3d3…

MALICIOUS

PDF

90.6 KB Created: 2020-08-06 18:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca696831029a95e6defc9ee951e3828 SHA-1: d4c3c8dcde68f3fa46cd107aedde4f5638db752a SHA-256: f544e3587eddb3d3642247bfb918ac026ce363a00e25ca4cb3249fa7402592ea
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for phishing or malware delivery. 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.ru/pify?keyword=atcc+animal+cell+culture+guide+pdf
    • http://files.nicollranch.com/uploads/1/3/1/1/131163740/vozekizamuzad-movobip-fetupuzefaruzab.pdf
    • http://files.aikidoithaca.com/uploads/1/3/0/7/130739495/c7586734e09.pdf
    • http://files.marielouisejones.com/uploads/1/3/1/0/131071249/7b14151.pdf
    • http://files.rocktron.com/uploads/1/3/2/6/132680955/junim.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/faniropegemikatizukeva.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/25114236942.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/sobife.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/serunupenawakuludowak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0863/8632/files/anemia_megaloblastica_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/geometric_sequence_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/exploring_creation_with_physical_science_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4696/8218/files/tetezekopa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/robuserukedudopuvawuput.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/45642444715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7053/7374/files/wolivetepitafeve.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_off00012692.bin
334bb025d4660274ee70ab1dc4c607bd678a650109f320cf1d23b19d741cd3c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 5284 bytes
font_01_sfnt_off00013877.bin
17002470d68154319313562a934199bbbc750c0cf77e968422d4ce025dec7380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 10812 bytes

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