Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d34bb84cb8051f9…

MALICIOUS

PDF

46.6 KB Created: 2020-08-07 07:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d606668f551e0a3ca02e16e2bba4eec SHA-1: a7f7c5dc52f81733a6f67509aca5794484b8eb36 SHA-256: 5d34bb84cb8051f9ba892bec5023ee9cd3f8d016ed5937202c0b06dd77885ead
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lead users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, likely for SEO manipulation or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users through a deceptive document, likely leading to a second-stage download or phishing attempt.

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=adulterants+in+food+pdf
    • http://files.bkdirrectconnect.com/uploads/1/3/1/1/131163635/8783716.pdf
    • http://files.pineridgepto.com/uploads/1/3/1/3/131380870/bagemaponini.pdf
    • http://files.number25deli.co.uk/uploads/1/3/2/6/132680822/fbffef669020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/kizog.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/abstraction_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/7369040498.pdf
    • https://cdn.shopify.com/s/files/1/0429/3292/8671/files/setevebomukotebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/5351040617.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/gepape.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/8438532356.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/python_remove_empty_string_from_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84407481133.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/business_plan_executive_summary_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/8604/4572/files/28162309065.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000782a.bin
0826ec1f3b7945994771bc00af7cd8e7c2415bdc4637508634e1417a418c5357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 5024 bytes
font_01_sfnt_off0000894e.bin
c571ff2edccb9b6508e1890873db215aceb306f1be9e686b8dd8784fcd0fa50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894E 10592 bytes

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