Malicious PDF — malware analysis report

Static analysis result for SHA-256 c168fc85440fef1c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-03 11:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e7c3b02e4978774e4cd68285d0727eb SHA-1: 217e5ad8561f67b6b1e7900dbaefa4b399a0597b SHA-256: c168fc85440fef1c33a6d29e8d0f5fa9652490a58016cc8d2dfc17021d7307de
120 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 PDF files hosted on various domains, including Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic, suggesting a lure to academic content to mask malicious activity. The presence of numerous external links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=anthropology+optional+syllabus+upsc+pdf
    • http://files.art-camp.org/uploads/1/3/1/4/131406448/rurokidoderakaw-zezujaziba.pdf
    • http://files.diamonddoula.com/uploads/1/3/0/8/130814714/2c2c78.pdf
    • http://files.joanavillaverde.com/uploads/1/3/1/1/131163832/pevedom.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2727/files/79493524705.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/aws_kms_decrypt.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/piduvimivafiwawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/1760157961.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/digital_design_morris_mano_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/kodixotosinabox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0486/files/77582447753.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/74807336578.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/vebusonepadibiniduw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/pabudivexogepijowixoni.pdf
    • https://cdn.shopify.com/s/files/1/0439/8071/8238/files/dns_server_unavailable.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/fupuxirorurixobefiweje.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_off000064aa.bin
6992230f91fbc1933715b5d19d1b02de8ce0881cd2b0249e64d0b7f4e206879c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AA 5648 bytes
font_01_sfnt_off000077df.bin
b4bc27defa4b4d72070fdbcdd6dd1c584de0a37b36aaa95b90be0c752d9fa092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DF 10144 bytes

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