Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81b2dd97e8c66ec…

MALICIOUS

PDF

38.7 KB Created: 2020-08-19 17:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aa696d459ba301b493429db1869e536 SHA-1: ab94619955c0993f5d87084e2717314f63294c25 SHA-256: c81b2dd97e8c66ec0b2767753cb2f0af2fd73de411125c8892aa5da90c3ef3ff
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating a phishing or scam attempt. The document body mentions 'Bedsheet design 2018' and includes the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.com/pify?keyword=bedsheet+design+2018
    • http://zanexem.throughmonstrouseyes.com/uploads/1/3/0/8/130814085/bububedawuxoloboz.pdf
    • http://files.drkathrynkimball.com/uploads/1/3/1/3/131379776/88f3c.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/75720210937.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/textbook_of_medical_physiology_ak_jain_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaxesajikibulunetegidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/51533486229.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/17169209683.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/puxubabirunatasi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6696/4630/files/rubivemekatikesidixuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/18528879448.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_off00005a10.bin
7873a45386525ff60549e64697de87c5eaa1d2688fc67c809e063bbd8369f5c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A10 5320 bytes
font_01_sfnt_off00006c27.bin
72d0029625fca650c208781417bab3c0ba719399af6eded49dae936d33528361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C27 10292 bytes

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