Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f3a6273b695bfc…

MALICIOUS

PDF

40.4 KB Created: 2020-08-20 09:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d956fb28b191d07d25b7a9879f316fb9 SHA-1: ad75050341f8afb4d2bdda9dbd4dfa42413bc2cc SHA-256: 66f3a6273b695bfcd3d4115e674490c65fa793f65c8ab67726cdec1835b25e57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or redirection attempt. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.cc', are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=haunted+forest+movie
    • http://sopogiwe.tatjanakusic.net/uploads/1/3/0/7/130739591/vikaxital.pdf
    • http://nulomaduw.raffaelecassina.com/uploads/1/3/0/8/130813965/sufozuzofo-tilepasokivej-vijunogawisosa-ginesoxujavuw.pdf
    • http://files.jin-li.org/uploads/1/3/1/4/131453718/24ebfff6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8439/9270/files/litutavowekove.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/67340662009.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1015/files/paradise_lost_book_11.pdf
    • https://cdn.shopify.com/s/files/1/0456/4808/5159/files/22355829735.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/benelitunejarajolilaxipob.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/lagu_123_chinese_zodiac.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/wonuwirajogafasakili.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/lewoxowenan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0042/1790/files/39474533734.pdf
    • https://cdn.shopify.com/s/files/1/0436/2246/5699/files/hypermobility_syndrome_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/25158035353.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/algebra_1_practice_questions_and_answers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061fd.bin
90f0cee942d31f5a61dc46f24dfcc40205d0331cdab159fdec0b8c0979cceb39
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 5040 bytes
font_01_sfnt_off00007311.bin
4097acdcb80aadab53028035fb56b7f82815b5e34e7d85ab0033e06d40da6a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 9924 bytes