Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd895086cc1a3f5…

MALICIOUS

PDF

45.5 KB Created: 2020-07-30 17:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038250dfe541a983c5385096ba7d905f SHA-1: 02e57aa2996fe49f6ccbb856c358188e08103244 SHA-256: 4fd895086cc1a3f55befde307f59ddeaaebd7e43ade61bdf3d0c7a0862653649
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate SEO or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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=behavioral+segmentation+pdf
    • http://files.klinikjubilee.com/uploads/1/3/1/4/131413362/vetesa.pdf
    • http://files.mammaonline.co.uk/uploads/1/3/1/4/131437878/duzusepupewetokovive.pdf
    • http://files.finewineandesotericspirits.com/uploads/1/3/1/6/131637850/xetefewilugibisixe.pdf
    • http://files.divinelighthealers.net/uploads/1/3/1/3/131381919/kixudo.pdf
    • http://files.tlcboutiquesc.com/uploads/1/3/2/7/132740637/noziwaxovegirinojele.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/26077256403.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/32861933415.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/tubuxisitelusudibudutido.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/30154173559.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/23380546306.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/46008446159.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/xutufawilimezepuxupodes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/12568870956.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/75047570522.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/polojokadamatijerux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/37248708708.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/26067810824.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/bejopepezikizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/46673702597.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72966212333.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/
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/30154173559.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007557.bin
4cba0d042c4154165eed8f7fe3ab97bc37940479804e4ede65e3893f527fefb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 5352 bytes
font_01_sfnt_off00008770.bin
dc2bf5149f599c99af1fbc671fad66bf097949e4d771ac46e563844a096726f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8770 9752 bytes