Malicious PDF — malware analysis report

Static analysis result for SHA-256 81608d968d93ae96…

MALICIOUS

PDF

55.1 KB Created: 2020-08-30 20:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d4f6900b7b087d5cd0d2b379e47bf90 SHA-1: 1053cba7219b404c50603f5d374e17c72e1442be SHA-256: 81608d968d93ae96f9c5bfa68fc4c4733014f452d947a9a7071f010fcb133f79
120 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, includes the search query "emergency care 13th edition pdf download" and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, further supporting the malicious intent of redirecting users to potentially harmful sites.

Heuristics 3

  • 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.
  • 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/wix?keyword=emergency+care+13th+edition+pdf+download
    • https://static.usrfiles.com/ugd/b8c837_14104f3d5adf4f858db1a113b1010be9.pdf
    • https://static.usrfiles.com/ugd/b8c837_47e4f217def14a49a6bad2a3b6129161.pdf
    • https://static.usrfiles.com/ugd/2f8cea_7caffc2ff2534e66b4f2b5e716259550.pdf
    • https://static.usrfiles.com/ugd/e5a943_9f9ff9255a8b4b8ab64fcd885405b7f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a427965a6c934825839395d22f6d7510.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/characteristics_of_centrally_planned_economy.pdf
    • https://cdn.shopify.com/s/files/1/0434/9385/1302/files/allison_automatic_transmission_operator_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/themeforest_wordpress_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/69171196988.pdf
    • https://cdn.shopify.com/s/files/1/0466/3289/4629/files/fatefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0777/7702/files/asco_febrile_neutropenia_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1526/files/salinijaxixexe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/mopijoxidatuvuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/algebra_booleana_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/74281399306.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_off000096b4.bin
841678835aa83846b2048d075cbae7ab2b6bed7498468fcfb5191ee0496ff590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B4 5760 bytes
font_01_sfnt_off0000aa32.bin
c78e693bf2a4011d5670d5379bdf8f8786b183b95f302741e6619dc105b6b5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA32 11008 bytes

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