Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3925f8c72215d4e…

MALICIOUS

PDF

48.2 KB Created: 2020-08-09 06:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: df487e742c240149f85d01ff61b71f8c SHA-1: 3af7d664cbe6de9493b97d6fb9d95ce7422e9fbe SHA-256: c3925f8c72215d4e97f9accb2ee0b9fac9969affd26e5d1d717edb39947f6d93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a free download for academic books, which redirects to a known malicious infrastructure. The presence of a link farm and the ML classifier's high confidence indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attack.

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=biochemistry+books+pdf+satyanarayana+free+download In PDF document text
    • http://files.angieskonacoffee.com/uploads/1/3/1/1/131164052/gufegivo.pdfIn PDF document text
    • http://files.sidewaysconfections.com/uploads/1/3/1/4/131437632/4370032.pdfIn PDF document text
    • http://files.e-fitpt.com/uploads/1/3/1/4/131410736/86b17e9d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/lelevugoneminufudebazotik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/55166525288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/zukigot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/derevamefizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/breast_cancer_awareness_month.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/31047558798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/asymptotes_chapter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/twitch_emote_count.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/30732660413.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D53 5844 bytes
SHA-256: 0efbf6b89cc2c6a11a6c5b249e480d172a8d984e90ce1d47b87aef364420d140
font_01_sfnt_off00009123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9123 10092 bytes
SHA-256: 94fea3fe8640bad46b86f11c596d7e84257c2f48579d325cd6d0e487f976969b

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