Malicious PDF — malware analysis report

Static analysis result for SHA-256 891646c18aba08f6…

MALICIOUS

PDF

33.7 KB Created: 2020-08-30 18:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed66639462cce2f4445633727f4b0479 SHA-1: ca9501fb0debedba54ce791e50a6e6b3c2eb83e8 SHA-256: 891646c18aba08f660e88b139469be42ba4e026580a70982b470c490950f7ed1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.com'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to school holidays.

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.com/wix?keyword=north+ayrshire+school+holidays+2018%252F
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/mikotulegulawutaxorexewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/18017038322.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/66920256595.pdf
    • https://static.usrfiles.com/ugd/50c35f_07ff29d2e27c4bf495b161e68b962082.pdf
    • https://static.usrfiles.com/ugd/b8c837_61e9ac62fda44b49bbb4f0c32d5f05b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f4b874ea354103be66a26c2c57c641.pdf
    • https://static.usrfiles.com/ugd/fd30ac_46080e84858d4b7f93937f4c4b100703.pdf
    • https://static.usrfiles.com/ugd/822ecd_2d98221b9c2e488db4ac3ad5da3581b4.pdf
    • https://static.usrfiles.com/ugd/8cbfce_c758fd7b9bfc42ba9946000a9c5cf7b8.pdf
    • https://static.usrfiles.com/ugd/0511f5_0cb52c6ca8e1481f9f139f83ccc55cde.pdf
    • https://cdn.shopify.com/s/files/1/0437/9253/1617/files/eastern_montana_craigslist.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/conversion_between_units_of_measurement_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/80647762973.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/algebra_word_problems_worksheet_grade_7.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_off00004598.bin
b485974bc19bcbdddf42b6af7e0816996f5d93c4ac57f5a3da25ac06d1822605
pdf-font-stream PDF embedded font (sfnt) at offset 0x4598 5652 bytes
font_01_sfnt_off000058eb.bin
d018fa3a9100ea2cdfa32604fbf4c2f44daac6cb63cb0f9caee12eaf150e4b97
pdf-font-stream PDF embedded font (sfnt) at offset 0x58EB 9656 bytes