Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cc031074c1b071…

MALICIOUS

PDF

38.6 KB Created: 2020-08-19 00:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93b6ed7abb33a39ad74fe131e7e4cf6 SHA-1: f13bf73330a37afc5bc04ddec319bdb27abf5790 SHA-256: e7cc031074c1b0712298b518e757d574b470c59008910a53cf979924c9d79910
152 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, many pointing to external PDF files hosted on various domains, including a known malicious redirector. This pattern is indicative of a link farm or SEO poisoning attack, designed to either distribute malware or manipulate search results. The ML classifier strongly supports the malicious nature of this PDF.

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=pacify+her+instrumental
    • http://files.dowhatyoulovenyc.com/uploads/1/3/2/6/132682739/2a11a.pdf
    • http://tuzawam.asroilpans.com/uploads/1/3/0/7/130739415/jurazejimipid-pokasozavoxul.pdf
    • http://fekume.nvclbaseball.org/uploads/1/3/0/8/130873822/tudodara_xonugab_japebasobufetin.pdf
    • http://files.krabi.fi/uploads/1/3/1/8/131856949/ef3be8bd7c3f.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/fipupapikuxamenan.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/54023153147.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/sopenoxatajowasagigexek.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/98283246755.pdf
    • https://cdn.shopify.com/s/files/1/0454/7356/2790/files/bilingualism_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/ccna_200_125_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/gantala_panchangam_2016_to_2017_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/46930234687.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6183/files/13877857257.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/corporate_finance_stephen_ross_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/english_grammar_book_9th_class.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_off00005a20.bin
a6f7ed44838bdc96f1944f4b968afd88474de02030a2a5cd9a27971a325f5888
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A20 5224 bytes
font_01_sfnt_off00006bbb.bin
9e3dcee80225d673bdefde8e4c69bfbd10da63298049231af5fd80a52548cdcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBB 9976 bytes