Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ebbab0d37cd38e…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 20:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51b20125bb4801e2595fdc6f2dee9c6d SHA-1: 09abb84fb03e36c6980809ee251e54fae15e9895 SHA-256: 21ebbab0d37cd38e25a5232e9750212755d1111bd6ed96a2ad9500e874a38187
140 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 external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=best+android+pdf+ebook+reader+app'. The document also impersonates a signing service, suggesting a phishing or social engineering lure. The presence of numerous links, including those hosted on Shopify, indicates a link farm designed to distribute malicious content or engage in SEO poisoning. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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.cc/pify?keyword=best+android+pdf+ebook+reader+app
    • http://files.myjlstyle.com/uploads/1/3/0/8/130874031/ritom_pukeziwit.pdf
    • http://files.mattarian.net/uploads/1/3/1/3/131383775/3308623.pdf
    • http://files.aldersgatecenter.org/uploads/1/3/2/7/132710795/9682808.pdf
    • http://timuxijol.theyogasocial.com/uploads/1/3/2/7/132740285/5592806.pdf
    • http://files.stephaniemeredithart.com/uploads/1/3/2/8/132814949/jasidagizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5387/files/classifying_triangles_by_sides_and_angles.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/evento_vascular_cerebral_isquemico_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/telecharger_adkar_sabah.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/97220344800.pdf
    • https://cdn.shopify.com/s/files/1/0435/6613/7507/files/bapalizeperer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4564/9574/files/potusowizutawab.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/pudunudizeniwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/31142333095.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/tosogiduzupofijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3446/7752/files/91662489168.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/91800357297.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_off000076f8.bin
02cd5b09ef20940c3ffcb29f9a2ad1cd8e746ee65324544f861748ff699e81d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F8 5256 bytes
font_01_sfnt_off000088e2.bin
e85d4c9b88e835eabb85671146d41564b1249194bf6245c3d77258897d8313ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E2 10684 bytes