Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fefddfcbefa7fc…

MALICIOUS

PDF

42.0 KB Created: 2020-08-25 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1832bc4549f83e079f56639833db630 SHA-1: 8abde81cc05fd62b3cb81a9aaf5cdde8a3bfc178 SHA-256: c7fefddfcbefa7fcc981a8346ffd677fdcef977cecd05a7b613dbdfe726f787f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about editorial cartooning. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to a harmful site.

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=editorial+cartooning+rules+pdf
    • http://files.magickc.org/uploads/1/3/0/7/130776200/merazusijadif_pikamafepuzoka_mebezufexov_woxef.pdf
    • http://bosenowu.ukturbulence.co.uk/uploads/1/3/2/8/132814930/32e108.pdf
    • http://files.allischley.com/uploads/1/3/0/8/130813054/xixozaxodob.pdf
    • http://files.westmilfordfarm.com/uploads/1/3/0/7/130739916/vubapapojate.pdf
    • https://cdn.shopify.com/s/files/1/0463/5285/9297/files/99161001774.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/matitadikufagez.pdf
    • https://cdn.shopify.com/s/files/1/0449/2309/3147/files/1_99_hunter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/5100/5590/files/longman_academic_writing_series_4_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/73431444435.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3073/files/git_add._vs_all.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/us_passport_renewal_application_form_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0438/7900/6376/files/bamini_tamil_font_layout.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/97366661232.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/befaladosomesojajuxokef.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/fudufidutej.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/86443655803.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/pepeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/burger_and_lobster_nyc_menu.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_off00006638.bin
d6017f9016ba3c7bbb5dea3dedf352c10a5c6b6855704ff2cec754aa31233626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6638 5280 bytes
font_01_sfnt_off0000783c.bin
f4dfd13a59a770e180b788ac33006fdf6cfc1dde2840edc9117182c93806e648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 10212 bytes

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