Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a47c0575c69aee0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-27 12:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2ad626dc302b6b4e4e7282bfef563f3 SHA-1: 3ca861c70d2f8d2babbca0d7e6d6ac006398b7bb SHA-256: 7a47c0575c69aee08e9663c7d31ffc02d449d43bda22f03feaabee50253c9d2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=introductory+circuit+analysis+boylestad', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it for a seemingly relevant search result. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=introductory+circuit+analysis+boylestad
    • http://taxes.n3vem.com/uploads/1/3/0/8/130813059/tovezolegi.pdf
    • http://files.chiciconic.com/uploads/1/3/0/7/130775151/senixasupaxi.pdf
    • http://tabajozez.unique-beginnings.com/uploads/1/3/2/7/132740905/3ce8177b8d.pdf
    • http://files.ccireenacting.westhistory.net/uploads/1/3/1/4/131483685/vufarinowidofi-fipilikozel-nabofimunugo-xomomonuvajux.pdf
    • http://files.clovercaredoulaservices.com/uploads/1/3/1/4/131410545/tivanozejin_wezev_nopibutal_lituruvunupado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/annamalaiyar_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/48669744839.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/6th_grade_math_workbook_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1438/1980/files/menotifikupojakogefuburov.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/gorolibefukik.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/bowolumiwesasugadujumeto.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/61290343448.pdf
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/fokoseki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7936/8858/files/may_june_2019_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/trees_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/attorney_authorization_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/mitabuvinodoweruxoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.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_off00006905.bin
c61f4041ce1624d647e83d9a5010ccd64d49ba8ee37642ea4fe305b1808b2632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6905 5112 bytes
font_01_sfnt_off00007a70.bin
f9fd500af6d723d0dcbf5d2e8ebd9bdf1517066d1d2934c8cedf967c1ea8e47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A70 10132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.