Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df41a4e475036eb…

MALICIOUS

PDF

52.1 KB Created: 2020-09-06 10:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3128eb5ef8e623d07f15f08dad7964a7 SHA-1: c52881ada08dd9a8e7b9fab4af1a00376986b99c SHA-256: 3df41a4e475036eb1446ef59ede7d28fc4ff3a2ccbe99dd1dfb47947c3850d0d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that is known to host malicious content. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, suggesting a broader campaign to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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.me/wix?keyword=free+sample+brochure+template
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/rakobetagodevasewopotiref.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/palidovuj.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/python_data_structures_and_algorithms_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/mathematics_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/29618184320.pdf
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/75811645564.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/conan_exiles_best_build.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0461/9829/2638/files/mafitop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/31889196991.pdf
    • https://static.usrfiles.com/ugd/b8c837_93df851ba33a428ba21dde46959a3e73.pdf
    • https://static.usrfiles.com/ugd/271e65_34f69b7828a94896a4c03c0e44cd88fd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008068.bin
4169992236c745a25c122967b2cb469556186d8e5fbdbdc31f8ee63226b99eee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 4996 bytes
font_01_sfnt_off00009164.bin
91e228aa410a7c2c9ecd5186f7d1cdbc0fc6ab62d4ec86f231df6e3870870f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9164 10544 bytes
font_02_sfnt_off0000b56f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 4324 bytes