Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd65a5bf0b765df1…

MALICIOUS

PDF

43.7 KB Created: 2020-08-20 14:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f58a5554c32b2efbdfb87c02762f845 SHA-1: 86f4d89f8b5a410d93aa1b1a646ceeb643dd7749 SHA-256: fd65a5bf0b765df19950c9bee14514acc234626f22e91f28d90f256c81d6d770
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The file was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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=invertebrate+paleontology+pdf
    • http://files.utduong.com/uploads/1/3/0/8/130874324/navog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/44267827178.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/logical_framework_of_a_project.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/autotune_vst_from_demo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/cadenas_musculares.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/guliw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/71557820065.pdf
    • https://cdn.shopify.com/s/files/1/0432/2639/8888/files/fuviforafixos.pdf
    • https://cdn.shopify.com/s/files/1/0459/9401/6935/files/10329954788.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1834/files/24742870235.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/11528119015.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f16.bin
c0a262235f2a9c40453ba396e6e648a340215411e4d994be534dc2549f3d18c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F16 5008 bytes
font_01_sfnt_off0000702e.bin
f8d5acc4fa86d70d355b130dac654c1a910d7da450d69501666c2fff5db22af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702E 10120 bytes
font_02_sfnt_off000092d5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D5 4324 bytes

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