Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb44bc663f33cd2…

MALICIOUS

PDF

63.6 KB Created: 2020-08-11 21:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4eb7e5aef3cc9d4d58ab6b89f0b7331 SHA-1: d1abb6dd85a233e6963a43895646668179ce6963 SHA-256: 8bb44bc663f33cd2daef173eba101d8d0aef14e135a0e4848d11c520347d617b
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm for SEO poisoning. The primary URL identified, 'https://ttraff.ru/pify?keyword=overcoming+barriers+to+communication+pdf', is a known malicious redirector. The document body, though heavily obfuscated, contains this URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=overcoming+barriers+to+communication+pdf
    • http://gazipu.tgcvdc.org/uploads/1/3/1/4/131454012/d7eba.pdf
    • http://files.kyliekissel.com/uploads/1/3/1/6/131606262/manexonifilufuposema.pdf
    • http://files.lincolnheightsbaptistchurch.com/uploads/1/3/0/7/130776817/30310.pdf
    • http://jivasarad.yvcnwarkansas.org/uploads/1/3/2/6/132683014/tejinu_molodekozarigu_gakeme.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/application_letter_for_ojt_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/carbon_sink_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/14181123910.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/82174030608.pdf
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/ludukedudipudukumetobasap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4261/1095/files/livro_after_5_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/4660/8794/files/64312876822.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/povenelomim.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/78168765725.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_off0000bbb2.bin
0764fdaf22a52755f707c2e8d436724828df110655c8fe53e5713aaeddbbd642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB2 5668 bytes
font_01_sfnt_off0000cee8.bin
d5d124d22a2541f11389b28a0b831309f953e9c95660ba311d3eeb19dfb47685		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 10004 bytes

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