Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a09fc9b3d1a6c1…

MALICIOUS

PDF

51.6 KB Created: 2020-08-21 01:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b50f963c8679ba1d2d4ae8ae657f7d51 SHA-1: 56b130ca6e2aa6d5a27043bddd05b74b17164ce8 SHA-256: 83a09fc9b3d1a6c1fead0c53be51bfa9d9a0dff9f372d8ab8be1577fba9aa0a1
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 a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of the primary links directs to a known malicious redirector, ttraff.com. The document body appears to be malformed or obfuscated, but the presence of numerous links, including one to a malicious redirector, strongly suggests an attempt to lure users to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

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=askep+pneumonia+pada+dewasa+pdf
    • http://tedefuro.cagedchicken.com/uploads/1/3/2/6/132681352/sixudiwisod_mupetemuxuxupif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/53688475384.pdf
    • https://cdn.shopify.com/s/files/1/0438/1091/4466/files/vugotu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/67828801487.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/41586998976.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/abkari_act_kerala.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/bonafide_application_form_rajasthan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/26271905865.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/ninovutid.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/putulagefawolukofawus.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_off00008c00.bin
fad245a8954bc171fa07de7f37428312d00f422e8a3ae019ad2cd9efaa1f440e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C00 5204 bytes
font_01_sfnt_off00009db8.bin
9b70a4679a46d8e096305cfa1b4131f95886b02b274b722035bbf67cfdde5a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB8 11000 bytes

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