Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec48fa6904a8836c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-09 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1077cbb1104c4607a02b36384fc7a83 SHA-1: ed0982b6b94c8ce4edddd84642d8d63fb65b5712 SHA-256: ec48fa6904a8836cc0a3a8ff0ff60057ac8119cd3db603a73fed447735d5e3d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute content through a link farm, ultimately leading to the malicious redirector.

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.ru/pify?keyword=littering+pollution+pdf
    • http://wanuv.soque.org/uploads/1/3/0/7/130776485/duditojefa.pdf
    • http://files.jackwarden.ca/uploads/1/3/1/3/131381452/6452075.pdf
    • http://files.shindigpublishing.com/uploads/1/3/1/8/131857540/2019771.pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/barriers_to_communication_in_educational_management.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2337/files/rabosekipufuporomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/ngrok_command_not_found.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/duzolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7749/files/jixafidiwilaxupokumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/mebane.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/porufatevizidozitaruma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/12192893801.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/work_asap_ferg_remix.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/free_online_accessibility_checker.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/medabetopef.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006673.bin
8d205d55f0a571122b7fb15ee87015aee839c59cb244bc327a7db04c4f289805
pdf-font-stream PDF embedded font (sfnt) at offset 0x6673 4764 bytes
font_01_sfnt_off000076c2.bin
ac705ea80c366c9842afc2a1d40f4d445664c784d880a3e422cd7f1751d2ef4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 9936 bytes