Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2253e5145373de8…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 21:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4c44b250f796ba3411086e8fea2486b SHA-1: 5986a8e3acb2b2d68fd8aef84a983d078d253079 SHA-256: c2253e5145373de8e70ec31f289bc1ad932a467bf934a6e4b18e19f2673b70d4
154 Risk Score

Malware Insights

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

The PDF document contains a link disguised as an 'Extraction lab report organic chemistry' which redirects to a malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms this malicious redirection. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the document is part of a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=extraction+lab+report+organic+chemistry
    • http://vidutoxi.cowboychrisbbq.com/uploads/1/3/1/8/131871980/kedarozilugogun.pdf
    • http://kuwup.shabbyology.com/uploads/1/3/1/6/131637223/2658115.pdf
    • http://files.stcharlespilgrimages.com/uploads/1/3/2/6/132682329/tuwov_gibugenodisok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9202/5249/files/6852471375.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/pafaverulirivoseva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/79598338082.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/labejif.pdf
    • https://cdn.shopify.com/s/files/1/0435/9313/8333/files/xozopozop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/59861069010.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_off0000643e.bin
f1b3b57dc69ad092c42e49c11f2df7d1002e37ca67bafa2cfd7c61f2ec74a820
pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 5616 bytes
font_01_sfnt_off0000772d.bin
84a14b0ac65a86bd4f49724a713101301b96d5a31bbef182497e41382a5f343b
pdf-font-stream PDF embedded font (sfnt) at offset 0x772D 10472 bytes