Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f5e1bbaa6002d6…

MALICIOUS

PDF

44.6 KB Created: 2020-08-18 18:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96e60c7521c0c898b20f8abf83ab67c1 SHA-1: 88afab4c73bd3cb46042ffe521c0bbddff95c6b8 SHA-256: 20f5e1bbaa6002d6f4d66cd1788c82278fa315b943019b6db36acc50355769f4
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier strongly supports the malicious nature of this PDF. 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=common+sense+questions+with+answer
    • http://zivudum.pamelameans.com/uploads/1/3/0/7/130776445/6bf0048f3f670.pdf
    • http://papav.everythingdamask.com/uploads/1/3/1/3/131380600/xelukiposorufemuseda.pdf
    • http://files.thethembaproject.org/uploads/1/3/2/7/132740541/692938.pdf
    • http://files.chickyfarmsvintage.com/uploads/1/3/0/7/130776680/9894132.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/vetetaganok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/digestion_anaerobia_y_aerobia.pdf
    • https://cdn.shopify.com/s/files/1/0435/1560/9243/files/86458801174.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8049/files/16907401566.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/83888524566.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/borufirikavabinivojivosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/bavifumenudomakopizowomow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/jetisenoduxozanojirizugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/39622163383.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/bekapekokusodisofezamo.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_off000071c5.bin
d6e512cb5d53632f588646fad80f723ce69ac0bbfb492153b50d39870df47c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 5016 bytes
font_01_sfnt_off000082b9.bin
f5b9556716586995e6c873800043f975cc91efaa3152328e407768454e470763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B9 10252 bytes

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