Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7adb21be7d8e054…

MALICIOUS

PDF

33.5 KB Created: 2020-08-28 16:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5a96b599919d498d91c946c61e0e5a5 SHA-1: 4a5cac3d9e9a98e5900348230566ec925afd2b5c SHA-256: b7adb21be7d8e05459653c38334b03a96249dce0ed0ca9d5714fee2481601b37
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a book download, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, many pointing to Shopify domains, likely part of an SEO spam campaign. The primary malicious IOC is the redirector URL: https://ttraff.cc/pify?keyword=the+bear+and+the+dragon+pdf+free+download.

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=the+bear+and+the+dragon+pdf+free+download In PDF document text
    • http://files.coachhouseaccommodationledbury.com/uploads/1/3/1/3/131379801/3281072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/nedenabive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/electronics_engineering_interview_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/79844287066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46506788711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/46538873140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/third_conditional_in_reported_speech.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/plasmolysis_in_onion_cells_lab_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/variety_show_x1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8132/6752/files/kagakiruwuvexezem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1915/6130/files/53878729940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045bb.bin
d391783008fe4d6234f2767a096144c4655707d67a525218b8c622eeb7bb4fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45BB 5308 bytes
font_01_sfnt_off000057d1.bin
87eb2f1d9039c349635790aed232fdd2d2ae9239def2f64df621e6f5eca3549e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D1 9880 bytes

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