Malicious PDF — malware analysis report

Static analysis result for SHA-256 648e2fc01e7eed61…

MALICIOUS

PDF

45.2 KB Created: 2020-07-30 06:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500be9b0ea82e5195a99c3925533ab53 SHA-1: 06584f3d58dbea853d1e64ca15d8214c583d9a8f SHA-256: 648e2fc01e7eed61098b44cfa31115a599cfa2bc22468957e82314501e191a64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, with one identified as a malicious redirector. The document body is heavily obfuscated, but the presence of 'wkhtmltopdf' suggests it was generated programmatically. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of PDF links, likely to manipulate search engine results or host malicious content.

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=el+pancreas+anatomia+pdf
    • http://files.sunsetairporttransportation.com/uploads/1/3/1/4/131437312/9096797.pdf
    • http://files.lavenderlanemi.com/uploads/1/3/2/6/132696263/302973682aa.pdf
    • http://files.imural.ca/uploads/1/3/1/3/131381288/7bacfec07d64f5.pdf
    • http://files.laahnco.com/uploads/1/3/1/3/131381658/nowowonojuguzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8220/2782/files/59543517772.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/53897748578.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/jodezapikoperinonim.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/mafikawalupoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/tudebokigexugifeberafefew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1620/8036/files/pidurotu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/53221701894.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5716/files/5666677452.pdf
    • https://cdn.shopify.com/s/files/1/0434/8248/0806/files/35546061336.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/88504770661.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/gunumatolem.pdf
    • https://cdn.shopify.com/s/files/1/0433/1805/0984/files/36840574716.pdf
    • https://cdn.shopify.com/s/files/1/0428/1732/3175/files/54821790017.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/momitejamijen.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_off00007483.bin
b2970e30eb9004077a4f0080066d9506a5384f52e6b66ea105009c7af6ebcb68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7483 5044 bytes
font_01_sfnt_off0000857e.bin
9691c2f661b50e96b06c6618d8bbf03a987cd92fa59a501bdc81a581a37e239b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857E 9996 bytes

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