Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ba33fc8129e83d…

MALICIOUS

PDF

50.6 KB Created: 2020-07-31 13:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbc677b225c03f4276c4812e183ec5a0 SHA-1: 2089999792e6dc42025883ccb24a88126cff78ab SHA-256: 12ba33fc8129e83db6a204bf0ab3c95000c00f5e63b37775ca465e813a62792f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to lure users with keywords like 'file excel to pdf'. The heuristic firings indicate the PDF is a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious sites. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence point to a phishing or scam 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.ru/pify?keyword=file+excel+to+pdf In PDF document text
    • http://files.vjbm.com/uploads/1/3/0/7/130739144/865764.pdfIn PDF document text
    • http://files.ignaciocarballo.com/uploads/1/3/1/1/131164112/1998454.pdfIn PDF document text
    • http://files.lasertoenailsanfrancisco.com/uploads/1/3/1/4/131453348/2863879.pdfIn PDF document text
    • http://files.juliewiegand.com/uploads/1/3/1/4/131453480/dd1b72145be5fa.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/1/0433/0687/7080/files/76685421079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/25598279807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/29345227173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/dimiwazodapib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/rabebezobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/5090917243.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/97696649789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/28280786933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/bikibowavavemutojanukan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/68307027193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/53828983509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/79921424090.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_off00008b20.bin
352e8e37dd63ad9444619449cc9a48ae5613a26a328ae637fdced27bfc752a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B20 4368 bytes
font_01_sfnt_off00009a04.bin
c170e45182d335321c1cbdcb4e38b5dc01eb2eb948cd8be8ee59956c7bcf0b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A04 10320 bytes

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