Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dc4ef847181abc…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 22:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b92b4f9701b632ca6505459f06e6c54 SHA-1: e1c8449afb18993d4c939596fd1d20c68e7c6cbd SHA-256: 14dc4ef847181abc57079ac3f1881db76a6f75b8e6900cb9547f9209955bb844
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc), and impersonates a cloud document lure. The ML classifier strongly flagged this PDF as malicious. The embedded links suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=top+assistant+apps+for+android
    • http://files.orienmcneill.com/uploads/1/3/1/4/131409761/9503586.pdf
    • http://files.themercylist.com/uploads/1/3/2/3/132302876/1ee656cd97cd7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/5120612798.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/traductor_aleman_espaol_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1570/7551/files/verakokosedog.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/resignation_letter_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8117/files/19459223836.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/wanuxedakodupeliw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/bbg_2._0.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/4784001027.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/gimozojibujivexijenaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/tinkerers_construct_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/rimuvolimafeke.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/23327253437.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000671e.bin
fb774d4e8bc752de6a59c5b3e737a2fd0615a44e640635e8118414f92a273f61
pdf-font-stream PDF embedded font (sfnt) at offset 0x671E 4952 bytes
font_01_sfnt_off000077fa.bin
0972e6fc740b1404c7b6f729ed5a7466da8b1ae13b91787df4a9ac6c8e3a2beb
pdf-font-stream PDF embedded font (sfnt) at offset 0x77FA 10196 bytes