Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cf71e337b87055…

MALICIOUS

PDF

41.9 KB Created: 2020-08-20 11:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9f674cfcdd2b50709f28653ba541df SHA-1: 50bc8ddf426fd19476d890d48441c2fc2d6cc042 SHA-256: 98cf71e337b87055342a8fa0df972db5af1510b4f4037cc1f9f9a1919b9aaddb
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also hosts a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URL points to a redirector that likely serves a malicious payload.

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/pify?keyword=vandana+shiva+soil+not+oil+pdf
    • http://koraze.leisurewatercraft.com/uploads/1/3/1/0/131070374/bewuwotera_zusirikimat_rexevuz.pdf
    • http://files.saveuisicklecell.com/uploads/1/3/0/7/130775859/500746db.pdf
    • http://files.soundteaching.net/uploads/1/3/0/7/130739648/a408eed83e.pdf
    • http://files.thecodicoyote.com/uploads/1/3/0/7/130776363/misumebiliki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/vonugotu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/gimuvunotozopa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1477/3147/files/fomisinuna.pdf
    • https://cdn.shopify.com/s/files/1/0453/8669/4824/files/types_of_total_knee_replacement.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/aidl_file_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/sabelexariwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/8330459622.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3341/files/physics_for_scientist_and_engineers_serway.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/adobe_flash_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/canzoniere_italiano_pianoforte.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3079/files/punawezosuvub.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/33296756778.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/35325871488.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_off0000680a.bin
ce3446379dc6905b9b82bea2d12fb397b7d3b9e7ce9ee885d698217ef1ecabda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680A 5060 bytes
font_01_sfnt_off00007948.bin
e99327dbe9edb613f8006a6ff5506cd3f6acdadc95fb8b3ab5b4330e4f58c156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7948 9688 bytes

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