Malicious PDF — malware analysis report

Static analysis result for SHA-256 c811e387962619fd…

MALICIOUS

PDF

35.4 KB Created: 2020-08-30 16:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32602a134a9135929d7ae2d1dc9353f8 SHA-1: e6a35016fd5222c39f7f62095ac12af15d243d05 SHA-256: c811e387962619fd26cd5d689fe4702b909780c7bf78feded091451f17a90ccd
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=free+mcboot+scph-70001, is identified as a malicious redirector. The presence of a link farm and a malicious redirector suggests a phishing or malware distribution attempt. 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.cc/wix?keyword=free+mcboot+scph-70001
    • https://cdn.shopify.com/s/files/1/0435/6653/0719/files/lewopomoworupeba.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3034/files/an_introduction_to_error_analysis_taylor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaxolaxowixinetubosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/72524474343.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3784/files/bukhari_sharif_download_islamic_foundation.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d1af00c1ee4338b3cfc7ea4d8fb1cf.pdf
    • https://static.usrfiles.com/ugd/ad2ade_2b62ecb81d6541c9a8be2cffac64bf7f.pdf
    • https://cdn.shopify.com/s/files/1/0428/6460/7398/files/17602256416.pdf
    • https://cdn.shopify.com/s/files/1/0434/0596/7514/files/dg_a_b_c_d_checks.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/barrancos_operatoria_dental.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/wewerabogafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/gambler_s_ruin_problem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/bronchiolitis_obliterans.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/28446391425.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_off00004d4c.bin
a31a2bc40cf27260e5d052facf720c24b0d2465d8c1bd249c62d03f003bd904f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4C 5332 bytes
font_01_sfnt_off00005f60.bin
ad25918c3278bd0f779399d2e302138de9273d43dc73d402b4e803262d497d84
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 9784 bytes