Malicious PDF — malware analysis report

Static analysis result for SHA-256 b839ad89acdcd270…

MALICIOUS

PDF

39.7 KB Created: 2020-08-24 18:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28307fcae0c6069aee190362089ab065 SHA-1: aaba2529456827855c3fc94fe05ec483e8e6525c SHA-256: b839ad89acdcd270d32fed92002310ad0725c5aec2ec68a18255492caba165ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body contains text related to 'google calendar online android' and a URL that appears to be a redirector, suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness.

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=google+calendar+online+android
    • http://fejela.watermarin.org/uploads/1/3/1/4/131453109/pulisaxopozaweza.pdf
    • http://files.justrightkennels.com/uploads/1/3/2/8/132815207/safirebowutuji.pdf
    • http://sokev.emw-d.com/uploads/1/3/0/8/130874429/koteluguxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/coming_back_to_life_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/poker_practice_against_a_computer.pdf
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/37160647150.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/xadazefufazufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/ticking_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/63715103431.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5207/files/getarunefenaminifibos.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/59797155908.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_off00005e56.bin
952ed77267ec1c0e52b9a5934a2c7144b12e0b67830365896a99decc6c07579c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E56 4960 bytes
font_01_sfnt_off00006f44.bin
137fef77138346996437abc37a56d489721aa5188930574f0f4719648375a5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F44 10352 bytes

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