Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd37b7b78c9b76c…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 15:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 586e3d009d78bc54c39861390bf9d9d5 SHA-1: c8d0ee04ee4c877bc77f6d73152706c2583e59f9 SHA-256: dcd37b7b78c9b76c183dd1d41ead98bf0fdab1c998b1692b3ded6959fc7f7290
120 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating an attempt to drive traffic to a malicious site. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=ielts+academic+writing+task+2+sample+answers+pdf', is a known malicious redirector. Additionally, the PDF links to numerous other PDFs hosted on cdn.shopify.com, suggesting a link farm used for SEO poisoning or traffic generation.

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=ielts+academic+writing+task+2+sample+answers+pdf
    • http://files.katascuba.com/uploads/1/3/1/4/131483253/5349126.pdf
    • http://files.tribeplatypus.com/uploads/1/3/1/4/131437174/dcf7f.pdf
    • http://files.kiefferphotography.com/uploads/1/3/2/7/132740378/fadet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2695/files/jazejewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/59942269680.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/19654538897.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/xogididotipisomawisovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/89551127913.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/goxagewesitavonub.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/wewivedapuronazixufopup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/8970273366.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/online_magazine_free_download.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_off000078e9.bin
c74a4328a4e7fb6773976e8310d454ff09f6ba1f95eda6bb492463604e9c5efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 5700 bytes
font_01_sfnt_off00008c59.bin
10099ad9fce32a5b616b8e9e631076f1310d429a16077703c1438105dfbcc49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 9892 bytes

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